Analysis
- max time kernel
149s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
- submitted
03/09/2026, 13:34
General
- Target WTSAPI32.dll
- Size 1.6MB
- Sample260903-qvba3syalg
- SHA256 64773e9b66825e3e3d653b730f2994eac6635d8166707d076371bb2ff2f7f434
Malware Config
Extracted
-
acrstealer
-
4.3.8-alpha2
-
sync.canyonmere.cc
-
cdnjs.cloudflare.com
-
ddrs
https://telegra.ph/C-Introduction-08-21
-
guids
01a034f4-51c1-7e0e-a650-137d7032a680
f1575b64-8492-4e8b-b102-4d26e8c70371
-
user_agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.2.6187.130 Safari/537.36
Signatures
- Family: ACR stealer,GrMsk
ACR stealer (aka GrMsk stealer) is an infostealer written in C++.
- Detects ACRStealer V4.x 17 IoCs
- Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
- Suspicious use of SetThreadContext 1 IoCs
- System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious behavior: EnumeratesProcesses 3 IoCs
- Suspicious use of WriteProcessMemory 7 IoCs
Processes
-
C:\Windows\system32\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\WTSAPI32.dll,#11⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Windows Mail\wab.exe"C:\Program Files (x86)\Windows Mail\wab.exe"2⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
-
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
memory/4548-0-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-2-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-3-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-5-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-6-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-4-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-8-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-12-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-16-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-20-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-52-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-58-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-62-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-108-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-144-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-152-0x0000000000400000-0x00000000004CB000-memory.dmp
memory/4548-156-0x0000000000400000-0x00000000004CB000-memory.dmp