Analysis
- max time kernel
149s - max time network
152s - platform
windows10-2004_x64 - resource
win10v2004-20230220-en - resource tags
- submitted
13/05/2023, 10:20
General
- Target qsteemp.exe
- Size 165KB
- Sample230513-mdc7kaga53
- SHA256 e76e206e8ae24f95a329b4f6ecdf1f22b76b07a8c628c0619b781bdba2d85732
Score
10/10
Malware Config
Signatures
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Checks computer location settings 2 TTPs 5 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 8 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Looks up external IP address via web service 3 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).
- Program crash 3 IoCs
- 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 4 IoCs
- Suspicious use of WriteProcessMemory 20 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.
Processes
-
C:\Users\Admin\AppData\Local\Temp\qsteemp.exe"C:\Users\Admin\AppData\Local\Temp\qsteemp.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "qsteemp" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\qsteemp.exe" &&START "" "C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe"2⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\chcp.comchcp 650013⤵
-
-
C:\Windows\system32\PING.EXEping 127.0.0.13⤵
- Runs ping.exe
-
-
C:\Windows\system32\schtasks.exeschtasks /create /tn "qsteemp" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe"C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe"3⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\tar.exe"C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp99B4.tmp" -C "C:\Users\Admin\AppData\Local\6kfrvwd31o"4⤵
-
-
C:\Users\Admin\AppData\Local\6kfrvwd31o\tor\tor.exe"C:\Users\Admin\AppData\Local\6kfrvwd31o\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\6kfrvwd31o\torrc.txt"4⤵
- Executes dropped EXE
-
-
-
-
C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exeC:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\6kfrvwd31o\tor\tor.exe"C:\Users\Admin\AppData\Local\6kfrvwd31o\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\6kfrvwd31o\torrc.txt"2⤵
- Executes dropped EXE
-
-
C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -u -p 1548 -s 20202⤵
- Program crash
-
-
C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -pss -s 408 -p 1548 -ip 15481⤵
-
C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exeC:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\6kfrvwd31o\tor\tor.exe"C:\Users\Admin\AppData\Local\6kfrvwd31o\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\6kfrvwd31o\torrc.txt"2⤵
- Executes dropped EXE
-
-
C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -u -p 2992 -s 19602⤵
- Program crash
-
-
C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -pss -s 464 -p 2992 -ip 29921⤵
-
C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exeC:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe1⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\6kfrvwd31o\tor\tor.exe"C:\Users\Admin\AppData\Local\6kfrvwd31o\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\6kfrvwd31o\torrc.txt"2⤵
- Executes dropped EXE
-
-
C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -u -p 1948 -s 19082⤵
- Program crash
-
-
C:\Windows\system32\WerFault.exeC:\Windows\system32\WerFault.exe -pss -s 504 -p 1948 -ip 19481⤵
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
cached-microdesc-consensus.tmp
cached-microdescs.new
hostname
port.dat
tor.exe
tor.exe
tor.exe
tor.exe
tor.exe
torrc.txt
qsteemp.exe.log
qsteemp.exe
qsteemp.exe
qsteemp.exe
qsteemp.exe
qsteemp.exe
tmp99B4.tmp
memory/1548-195-0x000001A7DD8D0000-0x000001A7DD8E0000-memory.dmp
memory/2000-133-0x0000025521FF0000-0x0000025522020000-memory.dmp
memory/2000-134-0x000002553C5F0000-0x000002553C600000-memory.dmp
memory/4888-185-0x0000024A4B2F0000-0x0000024A4B300000-memory.dmp
memory/4888-142-0x0000024A4B2F0000-0x0000024A4B300000-memory.dmp