Resubmissions
10/04/2024, 02:45
240410-c88xlscb891010/04/2024, 02:45
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240410-c86ggscb851014/10/2023, 02:07
231014-cj7cgsba8110Analysis
- max time kernel
110s - max time network
152s - platform
windows10-2004_x64 - resource
win10v2004-20230915-en - resource tags
- submitted
14/10/2023, 02:07
General
- Target I63f8affb2294c837814c33f5446924ba.exe
- Size 89KB
- Sample231014-cj7cgsba81
- SHA256 2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93
Malware Config
Signatures
- Detect Gurcu Stealer V3 payload 5 IoCs
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 3 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\I63f8affb2294c837814c33f5446924ba.exe"C:\Users\Admin\AppData\Local\Temp\I63f8affb2294c837814c33f5446924ba.exe"1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "I63f8affb2294c837814c33f5446924ba" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\I63f8affb2294c837814c33f5446924ba.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\chcp.comchcp 650013⤵
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C:\Windows\system32\PING.EXEping 127.0.0.13⤵
- Runs ping.exe
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C:\Windows\system32\schtasks.exeschtasks /create /tn "I63f8affb2294c837814c33f5446924ba" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe"C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe"3⤵
- Checks computer location settings
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
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C:\Windows\System32\tar.exe"C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmpD02C.tmp" -C "C:\Users\Admin\AppData\Local\jdm9hu6p1h"4⤵
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C:\Users\Admin\AppData\Local\jdm9hu6p1h\tor\tor.exe"C:\Users\Admin\AppData\Local\jdm9hu6p1h\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jdm9hu6p1h\torrc.txt"4⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exeC:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe1⤵
- Executes dropped EXE
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
I63f8affb2294c837814c33f5446924ba.exe
I63f8affb2294c837814c33f5446924ba.exe
I63f8affb2294c837814c33f5446924ba.exe
I63f8affb2294c837814c33f5446924ba.exe.log
tmpD02C.tmp
cached-microdesc-consensus.tmp
cached-microdescs.new
hostname
tor.exe
tor.exe
torrc.txt
memory/408-14-0x00007FFE36460000-0x00007FFE36F21000-memory.dmp
memory/408-15-0x000001B21CA90000-0x000001B21CAA0000-memory.dmp
memory/408-12-0x000001B21CA90000-0x000001B21CAA0000-memory.dmp
memory/408-11-0x00007FFE36460000-0x00007FFE36F21000-memory.dmp
memory/3096-0-0x0000021EEFF70000-0x0000021EEFF8C000-memory.dmp
memory/3096-6-0x00007FFE36EF0000-0x00007FFE379B1000-memory.dmp
memory/3096-2-0x0000021EF0330000-0x0000021EF0340000-memory.dmp
memory/3096-1-0x00007FFE36EF0000-0x00007FFE379B1000-memory.dmp