Analysis
- max time kernel
142s - max time network
154s - platform
windows10-2004_x64 - resource
win10v2004-20231127-en - resource tags
- submitted
15/12/2023, 03:05
General
- Target 6f8538fe93e6761ce8b120f2a6069183.exe
- Size 293KB
- Sample231215-dk6m1sabbl
- SHA256 8eb6a3a3ba316ea4dc3f609bdfc9779492c649887fc84f525bc4d1ffe0ea7634
Malware Config
Extracted
-
stealc
-
http://5.42.64.41
-
url_path
/40d570f44e84a454.php
Signatures
- Stealc
Stealc is an infostealer written in C++.
- Downloads MZ/PE file
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 2 IoCs
- Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Program crash 1 IoCs
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\6f8538fe93e6761ce8b120f2a6069183.exe"C:\Users\Admin\AppData\Local\Temp\6f8538fe93e6761ce8b120f2a6069183.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\6f8538fe93e6761ce8b120f2a6069183.exe" & del "C:\ProgramData\*.dll"" & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout /t 53⤵
- Delays execution with timeout.exe
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-
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3984 -s 22922⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 3984 -ip 39841⤵
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C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k UnistackSvcGroup1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Are.docx
mozglue.dll
nss3.dll
memory/3984-1-0x0000000000A20000-0x0000000000B20000-memory.dmp
memory/3984-2-0x00000000025C0000-0x00000000025DC000-memory.dmp
memory/3984-3-0x0000000000400000-0x000000000086A000-memory.dmp
memory/3984-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/3984-72-0x0000000000400000-0x000000000086A000-memory.dmp
memory/3984-85-0x0000000000A20000-0x0000000000B20000-memory.dmp
memory/3984-86-0x0000000000400000-0x000000000086A000-memory.dmp
memory/3984-87-0x00000000025C0000-0x00000000025DC000-memory.dmp
memory/4136-104-0x000001CEB8590000-0x000001CEB85A0000-memory.dmp
memory/4136-125-0x000001CEC0BA0000-0x000001CEC0BA1000-memory.dmp
memory/4136-120-0x000001CEC0B80000-0x000001CEC0B81000-memory.dmp
memory/4136-121-0x000001CEC0BA0000-0x000001CEC0BA1000-memory.dmp
memory/4136-122-0x000001CEC0BA0000-0x000001CEC0BA1000-memory.dmp
memory/4136-123-0x000001CEC0BA0000-0x000001CEC0BA1000-memory.dmp
memory/4136-124-0x000001CEC0BA0000-0x000001CEC0BA1000-memory.dmp
memory/4136-88-0x000001CEB8490000-0x000001CEB84A0000-memory.dmp
memory/4136-126-0x000001CEC0BA0000-0x000001CEC0BA1000-memory.dmp
memory/4136-127-0x000001CEC0BA0000-0x000001CEC0BA1000-memory.dmp
memory/4136-128-0x000001CEC0BA0000-0x000001CEC0BA1000-memory.dmp
memory/4136-129-0x000001CEC0BA0000-0x000001CEC0BA1000-memory.dmp
memory/4136-130-0x000001CEC0BA0000-0x000001CEC0BA1000-memory.dmp
memory/4136-131-0x000001CEC07D0000-0x000001CEC07D1000-memory.dmp