stealc | 8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483

General

Target

8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe
Size

1.6MB
MD5

8827b72c05014b90138757a5fcd53dcb
SHA1

c86c3ad9d3e7d489935c1a0b20195c157e17af00
SHA256

8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483
SHA512

d628031ebda17fcc21cb1f603f2498341ca948d5caa63396cc4bc8c9a75e6c6011c0813b18a660dcd8ae8946c4cf8bc4257699e08716446b21b57b1eeebe203b
SSDEEP

24576:spM5863IGfTAVpalBXUfMxVVtes12FxwojKr98YGeGG9i:spQLYkTYp6BXUkxVVChjHZQs

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://t.me/r8z0l

https://steamcommunity.com/profiles/76561199698764354

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 9 IoCs

stealer

Processes:

resource	yara_rule
behavioral1/memory/3980-1-0x0000000003FC0000-0x00000000040D0000-memory.dmp	family_vidar_v7
behavioral1/memory/1716-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/1716-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/1716-9-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/1716-11-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/1716-12-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/1716-13-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/1716-14-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/1716-15-0x0000000000400000-0x0000000000648000-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

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:

kat4F29.tmp

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	kat4F29.tmp

Executes dropped EXE 1 IoCs

Processes:

kat4F29.tmp

pid process

1716 kat4F29.tmp
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
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

pid	process
1716	kat4F29.tmp

Suspicious use of SetThreadContext 1 IoCs

Processes:

8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe

description	pid	process	target process
PID 3980 set thread context of 1716	3980	8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe	kat4F29.tmp

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:

kat4F29.tmp

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString kat4F29.tmp
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

2964 timeout.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

kat4F29.tmp

pid process

1716 kat4F29.tmp
1716 kat4F29.tmp

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat4F29.tmp

pid	process
2964	timeout.exe

pid	process
1716	kat4F29.tmp
1716	kat4F29.tmp

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exekat4F29.tmpcmd.exe

description	pid	process	target process
PID 3980 wrote to memory of 1716	3980	8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe	kat4F29.tmp
PID 3980 wrote to memory of 1716	3980	8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe	kat4F29.tmp
PID 3980 wrote to memory of 1716	3980	8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe	kat4F29.tmp
PID 3980 wrote to memory of 1716	3980	8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe	kat4F29.tmp
PID 3980 wrote to memory of 1716	3980	8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe	kat4F29.tmp
PID 3980 wrote to memory of 1716	3980	8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe	kat4F29.tmp
PID 3980 wrote to memory of 1716	3980	8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe	kat4F29.tmp
PID 3980 wrote to memory of 1716	3980	8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe	kat4F29.tmp
PID 1716 wrote to memory of 2896	1716	kat4F29.tmp	cmd.exe
PID 1716 wrote to memory of 2896	1716	kat4F29.tmp	cmd.exe
PID 1716 wrote to memory of 2896	1716	kat4F29.tmp	cmd.exe
PID 2896 wrote to memory of 2964	2896	cmd.exe	timeout.exe
PID 2896 wrote to memory of 2964	2896	cmd.exe	timeout.exe
PID 2896 wrote to memory of 2964	2896	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe
"C:\Users\Admin\AppData\Local\Temp\8b3beb56300575d8089ccb03fc35936cc85bfa5aaf436389d00994c3ede05483.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3980

C:\Users\Admin\AppData\Local\Temp\kat4F29.tmp
C:\Users\Admin\AppData\Local\Temp\kat4F29.tmp
2⤵
- Checks computer location settings
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1716

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat4F29.tmp" & rd /s /q "C:\ProgramData\JJDHIDBFBFHI" & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:2896

C:\Windows\SysWOW64\timeout.exe
timeout /t 10
4⤵
- Delays execution with timeout.exe
PID:2964

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat4F29.tmp
Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/1716-4-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/1716-8-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/1716-9-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/1716-11-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/1716-12-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/1716-13-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/1716-14-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/1716-15-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3980-0-0x0000000000840000-0x0000000000841000-memory.dmp

Filesize
4KB

Download
memory/3980-1-0x0000000003FC0000-0x00000000040D0000-memory.dmp

Filesize
1.1MB

Download
memory/3980-10-0x0000000000400000-0x0000000000594000-memory.dmp

Filesize
1.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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