stealc | a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c

General

Target
a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe
Size 2.4MB
Sample240607-a62z6sff94
SHA256 a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c
MD5 d53ef4e05951f5fbc0e35d3f773fff02
SHA1 003590641b1a9700ba999180d46157939b267327
SHA512 a82def65fa2bd34f9535c97e2343ce2f1e26a3d30811a057ee3d9a1dc582d012e2005140d938642d0317691ef1251a4741d1e05286403625e7493b9f65fb4a35
SSDEEP 49152:wQc81KnB/a/hNT/d9Ya8aesY3Ot4N7G/:wDta/hNT/d9n0etD/
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://t.me/ta904ek
https://steamcommunity.com/profiles/76561199695752269

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 8 IoCs

stealer

resource	yara_rule
behavioral2/memory/5036-1-0x0000000003EF0000-0x000000000403C000-memory.dmp	family_vidar_v7
behavioral2/memory/60-8-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/60-10-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/60-4-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/60-13-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/60-16-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/60-15-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/60-19-0x0000000000400000-0x0000000000649000-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

Executes dropped EXE 1 IoCs

pid	Process
60	kat71D4.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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5036 set thread context of 60	5036	a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe	72

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

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat71D4.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3364	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
60	kat71D4.tmp
60	kat71D4.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 5036 wrote to memory of 60	5036	a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe	72
PID 5036 wrote to memory of 60	5036	a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe	72
PID 5036 wrote to memory of 60	5036	a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe	72
PID 5036 wrote to memory of 60	5036	a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe	72
PID 5036 wrote to memory of 60	5036	a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe	72
PID 5036 wrote to memory of 60	5036	a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe	72
PID 5036 wrote to memory of 60	5036	a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe	72
PID 5036 wrote to memory of 60	5036	a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe	72
PID 60 wrote to memory of 4676	60	kat71D4.tmp	74
PID 60 wrote to memory of 4676	60	kat71D4.tmp	74
PID 60 wrote to memory of 4676	60	kat71D4.tmp	74
PID 4676 wrote to memory of 3364	4676	cmd.exe	76
PID 4676 wrote to memory of 3364	4676	cmd.exe	76
PID 4676 wrote to memory of 3364	4676	cmd.exe	76

C:\Users\Admin\AppData\Local\Temp\a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe
"C:\Users\Admin\AppData\Local\Temp\a7a91fea7f4b26d7caa5cb8d1e15a9fa1342b2c8ef36df498959cafd6d5a2a0c.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5036
- C:\Users\Admin\AppData\Local\Temp\kat71D4.tmp
  C:\Users\Admin\AppData\Local\Temp\kat71D4.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:60
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat71D4.tmp" & rd /s /q "C:\ProgramData\FIDHIEBAAKJD" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4676
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:3364

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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kat71D4.tmp

Path C:\Users\Admin\AppData\Local\Temp\kat71D4.tmp
Size 861KB
SHA256 6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795
MD5 66064dbdb70a5eb15ebf3bf65aba254b
SHA1 0284fd320f99f62aca800fb1251eff4c31ec4ed7
SHA512 b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f
SSDEEP 24576:o0ESdQpglO1CxDyawn27h+9hrlgKQY9SGcZwCdTp:o0RIglO1CuL9VNcaCd9
MD5 SHA1 SHA512 SSDEEP

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memory/60-8-0x0000000000400000-0x0000000000649000-memory.dmp

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memory/60-10-0x0000000000400000-0x0000000000649000-memory.dmp

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memory/60-4-0x0000000000400000-0x0000000000649000-memory.dmp

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memory/60-13-0x0000000000400000-0x0000000000649000-memory.dmp

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memory/60-16-0x0000000000400000-0x0000000000649000-memory.dmp

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memory/60-15-0x0000000000400000-0x0000000000649000-memory.dmp

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memory/60-19-0x0000000000400000-0x0000000000649000-memory.dmp

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memory/5036-0-0x00000000007B0000-0x00000000007B1000-memory.dmp

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memory/5036-1-0x0000000003EF0000-0x000000000403C000-memory.dmp

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memory/5036-9-0x0000000000400000-0x0000000000663000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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