Resubmissions
10/04/2024, 02:49
240410-da1n1sfe7v1010/04/2024, 02:49
240410-daz3gscc341010/04/2024, 02:48
240410-dazfyscc321010/04/2024, 02:48
240410-dayvesfe7s1014/10/2023, 03:45
231014-ea62gage6910Analysis
- max time kernel
298s - max time network
300s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
10/04/2024, 02:48
General
- Target B9a5797cb584014f3fede.exe
- Size 530KB
- Sample240410-dayvesfe7s
- SHA256 44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31
Malware Config
Extracted
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gurcu
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https://api.telegram.org/bot6176004110:AAFKA5be4dMwA848HWxzYIzrzzOGIHMOJGc/sendMessage?chat_id=615133582
Signatures
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Checks computer location settings 2 TTPs 7 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 12 IoCs
- Reads WinSCP keys stored on the system 2 TTPs
Tries to access WinSCP stored sessions.
- 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 1 IoCs
- Suspicious use of AdjustPrivilegeToken 7 IoCs
- Suspicious use of WriteProcessMemory 24 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\B9a5797cb584014f3fede.exe"C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.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 "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.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 "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.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\tmp3548.tmp" -C "C:\Users\Admin\AppData\Local\gzrj1xdnai"4⤵
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C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe"C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"4⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exeC:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe"C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exeC:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe"C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exeC:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe"C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exeC:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe"C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exeC:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe"C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"2⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
B9a5797cb584014f3fede.exe.log
B9a5797cb584014f3fede.exe
tmp3548.tmp
cached-microdesc-consensus.tmp
cached-microdescs.new
hostname
port.dat
tor.exe
torrc.txt
memory/3224-136-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/3224-135-0x00000225A8B60000-0x00000225A8C62000-memory.dmp
memory/3224-133-0x00000225A8910000-0x00000225A8920000-memory.dmp
memory/3224-132-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/3236-0-0x000002026D4D0000-0x000002026D55A000-memory.dmp
memory/3236-6-0x00007FFDB6630000-0x00007FFDB70F1000-memory.dmp
memory/3236-1-0x00007FFDB6630000-0x00007FFDB70F1000-memory.dmp
memory/3236-2-0x000002026D980000-0x000002026D990000-memory.dmp
memory/3652-79-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/3652-80-0x00000162C09D0000-0x00000162C09E0000-memory.dmp
memory/3652-83-0x00000162C09F0000-0x00000162C0AF2000-memory.dmp
memory/3652-84-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/4856-108-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/4856-104-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/4856-105-0x00000239C9900000-0x00000239C9910000-memory.dmp
memory/4856-107-0x00000239C9B40000-0x00000239C9C42000-memory.dmp
memory/4920-56-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/4920-67-0x0000020C9A360000-0x0000020C9A370000-memory.dmp
memory/4920-42-0x0000020C9A370000-0x0000020C9A472000-memory.dmp
memory/4920-12-0x0000020C9A360000-0x0000020C9A370000-memory.dmp
memory/4920-11-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/4980-120-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/4980-121-0x000002BB747D0000-0x000002BB747E0000-memory.dmp
memory/4980-123-0x000002BB75240000-0x000002BB75342000-memory.dmp
memory/4980-124-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/5024-152-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/5024-155-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp
memory/5024-154-0x000001F32FC70000-0x000001F32FD72000-memory.dmp