Analysis
- max time kernel
140s - max time network
147s - platform
windows10-2004_x64 - resource
win10v2004-20230915-en - resource tags
- submitted
03/10/2023, 15:38
General
- Target file.exe
- Size 296KB
- Sample231003-s2167ada3x
- SHA256 f36c198674bf407f576632eec261c78ceacde3532efaba78567e4c8a2850c499
Malware Config
Extracted
-
stealc
-
url_path
/e9c345fc99a4e67e.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 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
-
C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\file.exe" & del "C:\ProgramData\*.dll"" & exit2⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\timeout.exetimeout /t 53⤵
- Delays execution with timeout.exe
-
-
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 4404 -s 26282⤵
- Program crash
-
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4404 -ip 44041⤵
-
C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe1⤵
-
C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k UnistackSvcGroup1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
Are.docx
mozglue.dll
mozglue.dll
nss3.dll
store.jfm
memory/2456-130-0x000001B251C50000-0x000001B251C51000-memory.dmp
memory/2456-127-0x000001B251C50000-0x000001B251C51000-memory.dmp
memory/2456-135-0x000001B251C50000-0x000001B251C51000-memory.dmp
memory/2456-134-0x000001B251C50000-0x000001B251C51000-memory.dmp
memory/2456-133-0x000001B251C50000-0x000001B251C51000-memory.dmp
memory/2456-132-0x000001B251C50000-0x000001B251C51000-memory.dmp
memory/2456-131-0x000001B251C50000-0x000001B251C51000-memory.dmp
memory/2456-129-0x000001B251C50000-0x000001B251C51000-memory.dmp
memory/2456-128-0x000001B251C50000-0x000001B251C51000-memory.dmp
memory/2456-93-0x000001B249540000-0x000001B249550000-memory.dmp
memory/2456-109-0x000001B249640000-0x000001B249650000-memory.dmp
memory/2456-125-0x000001B251C20000-0x000001B251C21000-memory.dmp
memory/2456-126-0x000001B251C50000-0x000001B251C51000-memory.dmp
memory/4404-3-0x0000000000400000-0x0000000002290000-memory.dmp
memory/4404-92-0x0000000000400000-0x0000000002290000-memory.dmp
memory/4404-91-0x0000000000400000-0x0000000002290000-memory.dmp
memory/4404-1-0x00000000022D0000-0x00000000023D0000-memory.dmp
memory/4404-47-0x0000000003FD0000-0x0000000003FEB000-memory.dmp
memory/4404-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/4404-33-0x00000000022D0000-0x00000000023D0000-memory.dmp
memory/4404-22-0x0000000000400000-0x0000000002290000-memory.dmp
memory/4404-54-0x0000000000400000-0x0000000002290000-memory.dmp
memory/4404-2-0x0000000003FD0000-0x0000000003FEB000-memory.dmp