stealc | b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80

General

Target

b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe
Size

2.0MB
MD5

a6ba1c382a2a4cb00475297f88379e51
SHA1

b972a03263d3885fada271f6c452341feea9aa2f
SHA256

b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80
SHA512

886d377f796f46249e016bfa6a8068badf1648cefb98395783a42959c0abeb626e43700e622eccacf7a4f6eea10b4d51893bbffeb375c440738d2a030d106cfd
SSDEEP

49152:s4K3x1vUCJtTF+TxMoxc1TU+j+dAzGwlrh:s4Ex18CtIuoITsdZ

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 14 IoCs

stealer

resource	yara_rule
behavioral1/memory/4348-2-0x00000000040B0000-0x00000000041F9000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-8-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-10-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-17-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-18-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-35-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-36-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-52-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-53-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-64-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-65-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-66-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3216-69-0x0000000000400000-0x0000000000646000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation	kat48B1.tmp

Executes dropped EXE 1 IoCs

pid	Process
3216	kat48B1.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
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

description	pid	Process	procid_target
PID 4348 set thread context of 3216	4348	b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe	85

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	kat48B1.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
904	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3216	kat48B1.tmp
3216	kat48B1.tmp
3216	kat48B1.tmp
3216	kat48B1.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4348 wrote to memory of 3216	4348	b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe	85
PID 4348 wrote to memory of 3216	4348	b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe	85
PID 4348 wrote to memory of 3216	4348	b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe	85
PID 4348 wrote to memory of 3216	4348	b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe	85
PID 4348 wrote to memory of 3216	4348	b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe	85
PID 4348 wrote to memory of 3216	4348	b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe	85
PID 4348 wrote to memory of 3216	4348	b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe	85
PID 4348 wrote to memory of 3216	4348	b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe	85
PID 3216 wrote to memory of 3012	3216	kat48B1.tmp	100
PID 3216 wrote to memory of 3012	3216	kat48B1.tmp	100
PID 3216 wrote to memory of 3012	3216	kat48B1.tmp	100
PID 3012 wrote to memory of 904	3012	cmd.exe	102
PID 3012 wrote to memory of 904	3012	cmd.exe	102
PID 3012 wrote to memory of 904	3012	cmd.exe	102

C:\Users\Admin\AppData\Local\Temp\b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe
"C:\Users\Admin\AppData\Local\Temp\b44a383cb058e4d309eeded14756d22fbe2bcd5dd61251033b766dad8120ad80.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4348
- C:\Users\Admin\AppData\Local\Temp\kat48B1.tmp
  C:\Users\Admin\AppData\Local\Temp\kat48B1.tmp
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:3216
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat48B1.tmp" & rd /s /q "C:\ProgramData\FHCAFIDBKEBF" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3012
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:904

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat48B1.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/3216-18-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-64-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-20-0x000000001DC10000-0x000000001DE6F000-memory.dmp

Filesize
2.4MB

Download
memory/3216-10-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-35-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-69-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-17-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-36-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-8-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-4-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-66-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-52-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-53-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3216-65-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4348-2-0x00000000040B0000-0x00000000041F9000-memory.dmp

Filesize
1.3MB

Download
memory/4348-0-0x0000000002260000-0x0000000002261000-memory.dmp

Filesize
4KB

Download
memory/4348-9-0x0000000000400000-0x000000000060C000-memory.dmp

Filesize
2.0MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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