Malware Analysis – AppleJeus: JMT Trading

by | Feb 18, 2021 | Research

This Malware Analysis Report (MAR) is the result of analytic efforts among the Federal Bureau of Investigation (FBI), the Cybersecurity and Infrastructure Security Agency (CISA), and the Department of Treasury (Treasury) to highlight the cyber threat to cryptocurrency posed by North Korea, formally known as the Democratic People’s Republic of Korea (DPRK), and provide mitigation recommendations. Working with U.S. government partners, FBI, CISA, and Treasury assess that Lazarus Group—which these agencies attribute to North Korean state-sponsored advanced persistent threat (APT) actors—is targeting individuals and companies, including cryptocurrency exchanges and financial service companies, through the dissemination of cryptocurrency trading applications that have been modified to include malware that facilitates theft of cryptocurrency.

This MAR highlights this cyber threat posed by North Korea and provides detailed indicators of compromise (IOCs) used by the North Korean government. The U.S. Government refers to malicious cyber activity by the North Korean government as HIDDEN COBRA. For more information on other versions of AppleJeus and recommended steps to mitigate this threat, see Joint Cybersecurity Advisory AA21-048A: AppleJeus: Analysis of North Korea’s Cryptocurrency Malware at https://www.us-cert.cisa.gov/ncas/alerts/AA21-048A.

There have been multiple versions of AppleJeus malware discovered since its initial discovery in August 2018. In most versions, the malware appears to be from a legitimate-looking cryptocurrency trading company and website, whereby an unsuspecting individual downloads a third-party application from a website that appears legitimate.

The U.S. Government has identified AppleJeus malware version—JMT Trading—and associated IOCs used by the North Korean government in AppleJeus operations.

JMT Trading malware, discovered by a cybersecurity company in October 2019, is a legitimate-looking cryptocurrency trading software that is marketed and distributed by a company and website—JMT Trading and jmttrading[.]org, respectively—that appear legitimate.

For a downloadable copy of IOCs, see: MAR-10322463-2.v1.stix.

Submitted Files (6)

07c38ca1e0370421f74c949507fc0d21f4cfcb5866a4f9c0751aefa0d6e97542 (jmttrader.msi)

081d1739422bf050755e6af269a717681274821cea8becb0962d4db61869c5d6 (JMTTrader.exe)

4d6078fc1ea6d3cd65c3ceabf65961689c5bc2d81f18c55b859211a60c141806 (jmttrader_mac.dmg)

7ea6391c11077a0f2633104193ec08617eb6321a32ac30c641f1650c35eed0ea (JMTTrader)

9bf8e8ac82b8f7c3707eb12e77f94cd0e06a972658610d136993235cbfa53641 (CrashReporter.exe)

e352d6ea4da596abfdf51f617584611fc9321d5a6d1c22aff243aecdef8e7e55 (CrashReporter)

Domains (2)

beastgoc.com

jmttrading.org

Findings

07c38ca1e0370421f74c949507fc0d21f4cfcb5866a4f9c0751aefa0d6e97542

Tags

backdoordroppertrojan

Details
Name jmttrader.msi
Size 11524608 bytes
Type Composite Document File V2 Document, Little Endian, Os: Windows, Version 6.1, MSI Installer, Last Printed: Fri Dec 11 11:47:44 2009, Create Time/Date: Fri Dec 11 11:47:44 2009, Last Saved Time/Date: Fri Dec 11 11:47:44 2009, Security: 0, Code page: 1252, Revision Number: {A2814B39-244E-4899-81F9-F995B8DC1A80}, Number of Words: 2, Subject: JMTTrader, Author: JMT Trading Group LLC, Name of Creating Application: Advanced Installer 14.5.2 build 83143, Template: ;1033, Comments: This installer database contains the logic and data required to install JMTTrader., Title: Installation Database, Keywords: Installer, MSI, Database, Number of Pages: 200
MD5 c4aa6f87124320eadc342d2fe7364896
SHA1 4fcc84583126689d03acf69b9fca5632f7d44752
SHA256 07c38ca1e0370421f74c949507fc0d21f4cfcb5866a4f9c0751aefa0d6e97542
SHA512 51b34ae0a0e9252705206f2d9e87136706f51a70cc110e8493ff1266303ae33f09c1e89f329ae8f776a610c88f155e02afeb63a8bc7762ce307143fdff944172
ssdeep 196608:p/5qF8q187MZjfZjowfMjVS9Qkj6YotsEXw6xws8CV/KFmpZ3zyl:B5qCyBfRfMjVS4RXw6EFF
Entropy 7.962353
Antivirus
Ahnlab MSI/Dropper
Avira TR/Agent.rhbwd
Comodo Malware
Ikarus Trojan.Win32.Agent
Microsoft Security Essentials Backdoor:Win32/Stealer.A!MSR
NetGate Trojan.Win32.Malware
Symantec Trojan.Gen.MBT
TrendMicro Backdoo.80EE6F49
TrendMicro House Call Backdoo.80EE6F49
Relationships
07c38ca1e0… Downloaded_From jmttrading.org
07c38ca1e0… Contains 081d1739422bf050755e6af269a717681274821cea8becb0962d4db61869c5d6
07c38ca1e0… Contains 9bf8e8ac82b8f7c3707eb12e77f94cd0e06a972658610d136993235cbfa53641
Description

This Windows program from the JMTTrade GitHub site is a Windows MSI Installer. The installer looks legitimate and previously had a valid digital signature from Comodo (Sectigo). The signature was signed with a code signing certificate purchased by the same user as the SSL certificate for “jmttrading.org.” The installer asks for administrative privileges to run and while installing “JMTTrader.exe” (081d1739422bf050755e6af269a717681274821cea8becb0962d4db61869c5d6) in the “C:\Program Files (x86)\JMTTrader” folder, it also installs “CrashReporter.exe” (9bf8e8ac82b8f7c3707eb12e77f94cd0e06a972658610d136993235cbfa53641) in the “C:\Users\<username>\AppData\Roaming\JMTTrader” folder. Immediately after installation, the installer launches “CrashReporter.exe” with the “Maintain” parameter.

Screenshots

Figure 1 - Screenshot of the JMTTrader Installation.

Figure 1 – Screenshot of the JMTTrader Installation.

jmttrading.org

Tags

command-and-control

Whois

Whois for jmttrading.org had the following information on October 11, 2019:
Registrar: NameCheap
Created: July 11, 2019
Expires: July 11, 2020
Updated: September 10, 2019

Relationships
jmttrading.org Downloaded_To 4d6078fc1ea6d3cd65c3ceabf65961689c5bc2d81f18c55b859211a60c141806
jmttrading.org Downloaded_To 07c38ca1e0370421f74c949507fc0d21f4cfcb5866a4f9c0751aefa0d6e97542
Description

This site contained a “Download from GitHub” button which takes the user to the JMTTrader GitHub page (github.com/jmttrading/JMTTrader/releases) where both Windows and OSX versions of JMTTrader were available for download. There are also zip and a tar.gz files containing the source code. JMT Trading has a legitimately signed Sectigo SSL certificate. The SSL certificate was “Domain Control Validated,” just as the Celas LLC certificate for AppleJeus variant 1. The domain was registered at the IP address 198.187.29.20 with ASN 22612.

081d1739422bf050755e6af269a717681274821cea8becb0962d4db61869c5d6

Tags

trojan

Details
Name JMTTrader.exe
Size 2645744 bytes
Type PE32 executable (GUI) Intel 80386, for MS Windows
MD5 70cf78e117359b17f079c128fcead8c8
SHA1 8ec7f4b39f0843e5eae3b8af01578fd8e4432995
SHA256 081d1739422bf050755e6af269a717681274821cea8becb0962d4db61869c5d6
SHA512 8e21ea416f4c58743183394a28e347bc5c45f40306a8ffa7eef8403cf340538acf0794fd7bfdf60e120822fae5a21fc0f15de28cdf91d64f866781eb260b302e
ssdeep 49152:RHvo5BtSCkrN6DyhGr2W8Ujk4DJX4TnKuwdJg0b:65+rN+8GSog4lX/
Entropy 7.024119
Antivirus
Emsisoft MalCert.A (A)
Sophos Mal/BadCert-Gen
PE Metadata
Compile Date 2019-07-29 03:06:34-04:00
Import Hash 03d73bcb914fff965a82c9d9fe1fb7a1
Company Name JMT Trading Group
File Description JMT Trader
Internal Name JMT Trader
Legal Copyright JMT Trading Group (C) 2019
Original Filename JMTTrader.exe
Product Name Automatic Secure Bitcoin Trader Application
Product Version 1.40.42
PE Sections
MD5 Name Raw Size Entropy
f9a353aa651137f95669fd2b1a50e70b header 1024 3.181420
d00e20fb387da8ab6898391019288f30 .text 1181696 6.125747
c7fcd13c45b7c15042b8024839cf18c4 .rdata 1269248 7.095514
7504000617caec62a5a3221a785a58a8 .data 6144 4.261115
55550745e0d79ebbad96ac438f26f8a1 .rsrc 13312 7.626081
8ae8dead88483b69b09b01b024e882a2 .reloc 165376 6.784821
Packers/Compilers/Cryptors
Microsoft Visual C++ ?.?
Relationships
081d173942… Contained_Within 07c38ca1e0370421f74c949507fc0d21f4cfcb5866a4f9c0751aefa0d6e97542
Description

This file is a 32-bit Windows executable contained within the Windows MSI Installer “JMTTrader_Win.msi.” When executed, “JMTTrader.exe” asks for the user’s exchange, and then loads a legitimate cryptocurrency trading platform with no signs of malicious activity.

“JMTTrader.exe” is similar in appearance to version 1 and QT Bitcoin Trader. In addition to similar appearance, many strings found in “JMTTrader.exe” have QT Bitcoin Trader references and parameters being set to “JMT Trader” including but not limited to:

–Begin similarities–
String_ABOUT_QT_BITCOIN_TRADER_TEXT=JMT Trader
String_ABOUT_QT_BITCOIN_TRADER_TEXT=JMT Trader is a free Open Source project<br>developed on pure C++ Qt and OpenSSL.
QtBitcoinTraderClass
July IGHOR (note: Ighor July is one of the developers of QT Bitcoin Trader)
–End similarities–

The strings also reference the name “Gary Mendez” with email [email protected] as the author of “JMTTrader.exe.” There is also reference to an additional GitHub repository under the name Gary Mendez “github.com/garymendez/JMTTrader/issues.”

While the JMTTrader application is likely a modification of QT Bitcoin Trader, the legitimate QT Bitcoin Trader for Windows is not available for download as an MSI, but only as a Windows portable executable. This is a singular file named “QtBitcoinTrader.exe” and does not install or run any additional programs. The JMTTrader MSI contains “JMTTrader.exe,” the modified version of QT Bitcoin Trader, as well as the additional “CrashReporter.exe” (9bf8e8ac82b8f7c3707eb12e77f94cd0e06a972658610d136993235cbfa53641) executable not included with the original QT Bitcoin Trader.

Screenshots

Figure 2 - Screenshot of the JMTTrader Application.

Figure 2 – Screenshot of the JMTTrader Application.

9bf8e8ac82b8f7c3707eb12e77f94cd0e06a972658610d136993235cbfa53641

Tags

backdoortrojan

Details
Name CrashReporter.exe
Size 609008 bytes
Type PE32 executable (GUI) Intel 80386, for MS Windows
MD5 48971e0e71300c99bb585d328b08bc88
SHA1 ec8d7264953b5e9e416b7e8483954d9907278f2f
SHA256 9bf8e8ac82b8f7c3707eb12e77f94cd0e06a972658610d136993235cbfa53641
SHA512 6a664cd56e2201237bb24c148f39db6878e7cb6bb507290144f4cea327989535dbea64db11de398eee822aae56e873126dc95e2abf73642070f5f15c61d9eb19
ssdeep 12288:VhOHEwPzMEoJ1BpfYYPmrv3l1dxs6GWRGuGTi2euRBFXTnn8HPIRlxhD44ENrYAt:zOHEwPzMEoJ1BpfYYPmrv3l1dxs6GWRz
Entropy 6.526076
Antivirus
Ahnlab Trojan/Win32.Stealer
Antiy Trojan[Backdoor]/Win32.Stealer
Avira TR/Agent.lnumk
BitDefender Gen:Variant.Razy.567005
Comodo Malware
ESET a variant of Win32/NukeSped.GN trojan
Emsisoft MalCert.A (A)
Ikarus Trojan.Win32.Agent
K7 Trojan ( 005597f41 )
Lavasoft Gen:Variant.Razy.567005
Microsoft Security Essentials Backdoor:Win32/Stealer.A!MSR
NANOAV Trojan.Win32.Crypted.gczdoi
NetGate Trojan.Win32.Malware
Sophos Troj/APosT-L
Symantec Trojan.Gen.2
Systweak trojan.nukesped
TrendMicro Backdoo.80EE6F49
TrendMicro House Call Backdoo.80EE6F49
VirusBlokAda Backdoor.Agent
Zillya! Trojan.NukeSped.Win32.182
PE Metadata
Compile Date 2019-10-04 03:22:31-04:00
Import Hash 1513eba25694f99cecbcdc6cb414f6bd
PE Sections
MD5 Name Raw Size Entropy
cedc0880c9b0b6fea37e0079f1a4b406 header 1024 2.832478
189feb1b74269eaa7894c984df4268c3 .text 367104 6.351925
03c4cd021cfac8b5a8c0b944712e3217 .rdata 78336 4.408592
cf410dbcdd83eb2426120e72027f119b .data 130048 5.206737
bf619eac0cdf3f68d496ea9344137e8b .rsrc 512 0.000000
fe66dfb20b91197d86cc8bbf0fc7139c .reloc 23040 6.417054
Packers/Compilers/Cryptors
Microsoft Visual C++ ?.?
Relationships
9bf8e8ac82… Contained_Within 07c38ca1e0370421f74c949507fc0d21f4cfcb5866a4f9c0751aefa0d6e97542
9bf8e8ac82… Connected_To beastgoc.com
Description

This file is a 32-bit Windows executable contained within the Windows MSI Installer “JMTTrader_Win.msi.” Unlike the first version of the malware, “CrashReporter.exe” is installed in the “C:\Users\<username>\AppData\Roaming\JMTTrader,” which is a different folder than “JMTTrader.exe.” “CrashReporter.exe” is heavily obfuscated with the ADVObfuscation library, which has been renamed “snowman” by the malware writer. ADVObfuscation is described as using C++ 11/14 language to generate, at compile time, obfuscated code without using any external tool and without modifying the compiler and introduces some form of randomness to generate polymorphic code like the encryption of strings literals and the obfuscation of calls using finite state machines. Due to this obfuscation, detailed functionality can be difficult to determine to the extent of the non-obfuscated “Updater.exe” binary.

At launch, “CrashReporter.exe” first checks for the “Maintain” parameter and if not found, exits the program to likely evade detection in a sandbox environment. The malware collects basic victim information and encrypts the data with the hardcoded XOR key “X,%`PMk–Jj8s+6=15:20:11.”

The encrypted data is sent to “hxxps[:]//beastgoc.com/grepmonux.php” with a multipart form data separator “–wMKBUqjC7ZMG5A5g.”

The malware’s capabilities include reading/writing itself to various directories, querying/writing to the registry, searching for files, extract/decode payload, and terminating processes. “CrashReporter.exe” also creates a scheduled SYSTEM task named “JMTCrashReporter,” which runs the “CrashReporter.exe” program with the “Maintain” parameter at the login of any user.

Screenshots

Figure 3 - Hard-coded XOR key and XOR encryption.

Figure 3 – Hard-coded XOR key and XOR encryption.

Figure 4 - Screenshot of the "JMTCrashReporter" scheduled task.

Figure 4 – Screenshot of the “JMTCrashReporter” scheduled task.

beastgoc.com

Tags

command-and-control

URLs
  • https[:]//beastgoc.com/grepmonux.php
Whois

Whois information for the domain beastgoc.com on October 11, 2019 was as follows:
Registrar: NameCheap
Created Date: July 19, 2019
Expiration Date: July 19, 2020

Relationships
beastgoc.com Connected_From 9bf8e8ac82b8f7c3707eb12e77f94cd0e06a972658610d136993235cbfa53641
beastgoc.com Connected_From e352d6ea4da596abfdf51f617584611fc9321d5a6d1c22aff243aecdef8e7e55
Description

The site “beastgoc.com” had as valid digital signature signed by Sectigo. This is a “Domain Control Validated” signature, which is the lowest level of validation. The domain was registered at the IP address 185.228.83.32 with ASN 205406.

4d6078fc1ea6d3cd65c3ceabf65961689c5bc2d81f18c55b859211a60c141806

Tags

backdoortrojan

Details
Name jmttrader_mac.dmg
Size 13583316 bytes
Type zlib compressed data
MD5 39cdf04be2ed479e0b4489ff37f95bbe
SHA1 74390fba9445188f2489959cb289e73c6fbe58e4
SHA256 4d6078fc1ea6d3cd65c3ceabf65961689c5bc2d81f18c55b859211a60c141806
SHA512 d04bc9adbe56414ec2cba134ebf8af42ef79495a89748367464e73c6dd69fd978a194df23a646ff90d45114bf68a93f580cd540ba3b600a6524b198294416148
ssdeep 393216:sEFxMIZkTx7Nzm4qbicUC7Gk6RH1NBTtJRr49Hg4pgl:sEFiIYw4u8HxTDOi
Entropy 7.997633
Antivirus
Ahnlab Backdoor/OSX.NukeSped
Antiy Trojan/Win32.Casdet
Avira OSX/W97M.CVE-2017-8759.wrdas
BitDefender Trojan.MAC.Lazarus.G
Comodo Malware
Cyren Trojan.HUJK-1
ESET OSX/NukeSped.B trojan
Emsisoft Trojan.MAC.Lazarus.G (B)
Ikarus Trojan.Win32.Casdet
Lavasoft Trojan.MAC.Lazarus.G
McAfee OSX/Nukesped.d
Microsoft Security Essentials Trojan:MacOS/NukeSped.A!MTB
Sophos OSX/Lazarus-E
Symantec OSX.Trojan.Gen
TrendMicro Backdoo.6FE2634B
TrendMicro House Call Backdoo.6FE2634B
Zillya! Backdoor.Agent.OSX.57
Relationships
4d6078fc1e… Downloaded_From jmttrading.org
4d6078fc1e… Contains 7ea6391c11077a0f2633104193ec08617eb6321a32ac30c641f1650c35eed0ea
4d6078fc1e… Contains e352d6ea4da596abfdf51f617584611fc9321d5a6d1c22aff243aecdef8e7e55
Description

This OSX program from the JMTTrader GitHub is an Apple DMG installer. The OSX program has very similar functionality to the Windows program, but does not have a digital signature. Again, the installer appears to be legitimate and installs both JMTTrader in the “/Applications/JMTTrader.app/Contents/MacOS/” folder and a hidden program named “.CrashReporter” in the “/Applications/JMTTrader.app/Contents/Resources/” folder. The installer contains a postinstall script (see Figure 5).

This postinstall script has similar functionality to the postinstall script of the first version but has a few additional features. It still moves the hidden plist file (.com.jmttrading.plist) to the LaunchDaemons folder, but also changes the file permissions on the plist. Once in the LaunchDaemons folder, this program will be ran on system load as root for every user, which will launch the CrashReporter program with the Maintain parameter.

The postinstall script also moves the “.CrashReporter” program to a new location “/Library/JMTTrader/CrashReporter” and makes it executable. Like CelasTradePro, as the LaunchDaemon will not run automatically after the plist file is moved, the postinstall script then launches the CrashReporter program with the Maintain parameter and runs it in the background (&).

The package also has “Developed by Gary Mendez. JMTTrading Group” in the Info.plist properties file.

Screenshots

Figure 5 - Screenshot of the postinstall script included in OSX JMTTrader installer.

Figure 5 – Screenshot of the postinstall script included in OSX JMTTrader installer.

Figure 6 - Screenshot of the "com.jmttrading.plist" file.

Figure 6 – Screenshot of the “com.jmttrading.plist” file.

7ea6391c11077a0f2633104193ec08617eb6321a32ac30c641f1650c35eed0ea

Tags

trojan

Details
Name JMTTrader
Size 3585364 bytes
Type Mach-O 64-bit x86_64 executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|WEAK_DEFINES|BINDS_TO_WEAK|PIE>
MD5 ffc2a7073ba362b295357ac6e782634a
SHA1 6d13e85cd812e249ab950ec405e84289de9cfe5e
SHA256 7ea6391c11077a0f2633104193ec08617eb6321a32ac30c641f1650c35eed0ea
SHA512 1d14e41e306816323fcaa54fb7f420148c50fc0388a86178a41ce63c9fc5b1f29d2614d9c8445a13198c6920d4bded3dbf48641ee4795dbef4b78e6c48b91a80
ssdeep 98304:rDhoAFpEA86GIleAdNH2vFywLw6mkJarN+8GSy:b5HrNiSy
Entropy 6.796243
Relationships
7ea6391c11… Contained_Within 4d6078fc1ea6d3cd65c3ceabf65961689c5bc2d81f18c55b859211a60c141806
Description

This OSX sample was contained within Apple DMG Installer “JMTTrader_Mac.dmg.” When exexuted, JMTTrader has identical functionality and appearance to the Windows JMTTrader.exe. It asks for the user’s exchange and loads a legitimate cryptocurrency trading application with no signs of malicious activity. While the appearance has changed slightly from the CelasTradePro application, JMTTrader is close in appearance to both CelasTradePro and QT Bitcoin Trader, and is likely a modification of the OSX QT Bitcoin Trader.

In addition to similar appearance, many strings found in JMTTrader have QT Bitcoin Trader references and parameters being set to “JMT Trader” including but not limited to:

–Begin similarities–
String_ABOUT_QT_BITCOIN_TRADER_TEXT=JMT Trader
String_ABOUT_QT_BITCOIN_TRADER_TEXT=JMT Trader is a free Open Source project<br>developed on pure C++ Qt and OpenSSL.
User-Agent: Qt Bitcoin Trader v1.40.42
July IGHOR (note: Ighor July is one of the developers of QT Bitcoin Trader)
–End similarities–

The strings also reference the name “Gary Mendez” with email [email protected] as the author of JMTTrader.exe. There is also reference to an additional GitHub repository under the name Gary Mendez “github.com/garymendez/JMTTrader/issues.”

While the JMTTrader application is likely a modification of QT Bitcoin Trader, the legitimate QT Bitcoin Trader DMG for OSX does not contain the postinstall script nor the plist file which creates a LaunchDaemon. When executed, only QTBitcoinTrader will be installed, and no additional programs will be created, installed, or launched.

In contrast, the JMTTrader DMG contains the CelasTradePro OSX executable, the modified version of QT Bitcoin Trader, as well as the additional CrashReporter OSX executable not included with the original QT Bitcoin Trader.

e352d6ea4da596abfdf51f617584611fc9321d5a6d1c22aff243aecdef8e7e55

Tags

trojan

Details
Name CrashReporter
Size 39168 bytes
Type Mach-O 64-bit x86_64 executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE>
MD5 6058368894f25b7bc8dd53d3a82d9146
SHA1 8644da026f9e8873dd8699bd68c77a25001be726
SHA256 e352d6ea4da596abfdf51f617584611fc9321d5a6d1c22aff243aecdef8e7e55
SHA512 d849270a89d8ab52006dd92557d82e9966ecb9a8958a1e84510ef67bc085fa4f6eb7142c0b045e3aa9932e5a270981aba7f3fc147222d9277272c227e246797e
ssdeep 384:TgSifNpZ0XMY923gMnldxdzd7tmEtP0lLnXjXZfV:TgTFp8EgMD9WXj
Entropy 2.672204
Antivirus
Ahnlab OSX/Agent
Antiy Trojan/Mac.NukeSped
Avira OSX/Agent.qhhyt
BitDefender Trojan.MAC.Agent.DU
ClamAV Osx.Malware.Agent-7335874-0
ESET OSX/NukeSped.B trojan
Emsisoft Trojan.MAC.Agent.DU (B)
Ikarus Trojan.OSX.Agent
Lavasoft Trojan.MAC.Agent.DU
McAfee OSX/Nukesped.a
Microsoft Security Essentials Trojan:MacOS/NukeSped.A!MTB
NANOAV Trojan.Mac.NukeSped.gdjieu
Quick Heal MacOS.Trojan.39995.GC
Sophos OSX/Lazarus-E
Symantec OSX.Trojan.Gen
TrendMicro Trojan.BC5298BA
TrendMicro House Call Trojan.BC5298BA
Zillya! Trojan.NukeSped.OSX.2
Relationships
e352d6ea4d… Contained_Within 4d6078fc1ea6d3cd65c3ceabf65961689c5bc2d81f18c55b859211a60c141806
e352d6ea4d… Connected_To beastgoc.com
Description

This OSX sample was contained within Apple DMG Installer “JMTTrader_Mac.dmg.” CrashReporter likely functions very similarly to the Windows CrashReporter.exe program, but unlike the Windows program, it is not obfuscated. This lack of obfuscation makes it easier to determine the program’s functionality in detail.

Upon launch, the malware checks for the “Maintain” parameter, and will exit if the parameter is not found, likely to avoid sandbox analysis.

CrashReporter then creates a randomly generated token (identifier) and collects the binary’s version and process ID to send to the server. This data is XOR encrypted with the hard-coded key “X,%`PMk–Jj8s+6=\x02” (last value is a non-printable ASCII character which is hexadecimal \x02). While the key is different than the XOR key for the Windows sample, the first 16 bytes are the same.

The encrypted data is sent to the same C2 server as the Windows sample at hxxps[:]//beastgoc.com/grepmonux.php with the multipart data form separator “jGzAcN6k4VsTRn9”. CrashReporter also has a hard-coded user-agent string: “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36” along with other hard-coded values sent with the data including “token,” “query,” and “mont.jpg.”

If CrashReporter receives a response with the HTTP code 200 (successful), it will invoke another function which will wait for tasking from the C2 server. When a tasking is received, the function decrypts the data with the same hardcoded XOR key and processes the tasking. Accepted tasking commands include the following:

–Begin accepted tasking commands–
“exit”: this command will cause CrashReporter to gracefully exit
“up”: this command will upload a file from the C2 server to the infected host
“stand ”: this command will execute commands from the server via the shell using the popen API (the “popen()” function opens a process by creating a bidirectional pipe, forking, and invoking the shell)
–End accepted tasking commands–

These possible commands from the C2 server gives the remote attacker full control over the OSX system. It is likely that the functionality of the Windows CrashReporter.exe is the same as this OSX malware, as the original AppleJeus had the same functionality on both operating systems.

Screenshots

Figure 7 - Screenshot of the maintain parameter verification in CrashReporter.

Figure 7 – Screenshot of the maintain parameter verification in CrashReporter.