stealc | 51cba9b4aefefaf72a791e1929f98553f50d643a22179a6aaac9d13f45ea8b43

General

Target

file.exe
Size

355KB
MD5

22152460b13e4c2473dc3fcdea192933
SHA1

48ce4a69302e860cd905cd02a10aac942f09d9f3
SHA256

51cba9b4aefefaf72a791e1929f98553f50d643a22179a6aaac9d13f45ea8b43
SHA512

1dbcc6f21c9adfc4f28434cffac8c00fb251e3fbf574a69345792837989f74bfc74a67462e7c4f71333a07caf90e0f3e6c51daf0b2640bae3e06af14c8855104
SSDEEP

6144:KnRqyzZ8VqCaMx3CkcY7FGCdGr0gx1POGIAYanWdHBSxz27XrvnksFwemJ:6RqyzZ2IOGCgfPOGI2nWdhSzUbkReG

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://steamcommunity.com/profiles/76561199689717899

https://t.me/copterwin

Attributes

user_agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:128.0) Gecko/20100101 Firefox/128.0

Signatures

Detect Vidar Stealer 11 IoCs

stealer

Processes:

resource	yara_rule
behavioral2/memory/1052-2-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1052-7-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1052-5-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1052-16-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1052-17-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1052-34-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1052-35-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1052-51-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1052-52-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1052-63-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1052-64-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar
Downloads MZ/PE file
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

RegAsm.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation RegAsm.exe
Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
Suspicious use of SetThreadContext 1 IoCs

Processes:

file.exe

description pid process target process

PID 4256 set thread context of 1052 4256 file.exe RegAsm.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Checks processor information in registry 2 TTPs 1 IoCs
Processor information is often read in order to detect sandboxing environments.

Query Registry
T1012

System Information Discovery
T1082

Processes:

RegAsm.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString RegAsm.exe
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

1564 timeout.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

RegAsm.exe

pid process

1052 RegAsm.exe
1052 RegAsm.exe
1052 RegAsm.exe
1052 RegAsm.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	RegAsm.exe

description	pid	process	target process
PID 4256 set thread context of 1052	4256	file.exe	RegAsm.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	RegAsm.exe

pid	process
1564	timeout.exe

pid	process
1052	RegAsm.exe
1052	RegAsm.exe
1052	RegAsm.exe
1052	RegAsm.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

file.exeRegAsm.execmd.exe

description	pid	process	target process
PID 4256 wrote to memory of 1492	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1492	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1492	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 3628	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 3628	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 3628	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 3740	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 3740	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 3740	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 884	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 884	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 884	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1052	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1052	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1052	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1052	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1052	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1052	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1052	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1052	4256	file.exe	RegAsm.exe
PID 4256 wrote to memory of 1052	4256	file.exe	RegAsm.exe
PID 1052 wrote to memory of 1888	1052	RegAsm.exe	cmd.exe
PID 1052 wrote to memory of 1888	1052	RegAsm.exe	cmd.exe
PID 1052 wrote to memory of 1888	1052	RegAsm.exe	cmd.exe
PID 1888 wrote to memory of 1564	1888	cmd.exe	timeout.exe
PID 1888 wrote to memory of 1564	1888	cmd.exe	timeout.exe
PID 1888 wrote to memory of 1564	1888	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4256

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
2⤵
PID:1492

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
2⤵
PID:3628

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
2⤵
PID:3740

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
2⤵
PID:884

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
2⤵
- Checks computer location settings
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1052

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\DGHCBAAEHCFI" & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:1888

C:\Windows\SysWOW64\timeout.exe
timeout /t 10
4⤵
- Delays execution with timeout.exe
PID:1564

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

4

T1552

Credentials In Files

4

T1552.001

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

4

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/1052-34-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1052-19-0x000000001BBB0000-0x000000001BE0F000-memory.dmp

Filesize
2.4MB

Download
memory/1052-2-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1052-64-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1052-7-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1052-5-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1052-63-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1052-17-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1052-16-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1052-52-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1052-35-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/1052-51-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4256-0-0x00000000001C0000-0x00000000001C1000-memory.dmp

Filesize
4KB

Download
memory/4256-1-0x00000000001C0000-0x00000000001C1000-memory.dmp

Filesize
4KB

Download
memory/4256-3-0x00000000001C0000-0x00000000001C1000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads