stealc | fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1

Analysis

max time kernel
146s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
07/06/2024, 22:58

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General

Target
fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe
Size 2.5MB
Sample240607-2xx4eaef92
SHA256 fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1
MD5 6853c792f9e49611166fad1423170e3a
SHA1 f1ac017f194323b45c623f15d9f8e7177b8693f5
SHA512 1f5c7a1fee8d64a0bc24d58249a4b73d30b87d24932c9340c5650c5417df0a78839d1aa3695bdf05845b76e2ad6271117736d47f95ea28b202ba05a810ad4148
SSDEEP 49152:Zcm4081qpZBUbHEmJtsEAQACR07Q3byRD8aXY658:ZcmmqvBUbHtDfAw07QLyLn
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

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 13 IoCs

stealer

resource	yara_rule
behavioral2/memory/128-2-0x0000000002BF0000-0x0000000002D53000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-10-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-15-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-16-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-33-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-34-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-50-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-51-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-62-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-63-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1116-66-0x0000000000400000-0x0000000000648000-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
Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
1116	kat6C08.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 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 128 set thread context of 1116	128	fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe	80

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	kat6C08.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4960	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1116	kat6C08.tmp
1116	kat6C08.tmp
1116	kat6C08.tmp
1116	kat6C08.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 128 wrote to memory of 1116	128	fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe	80
PID 128 wrote to memory of 1116	128	fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe	80
PID 128 wrote to memory of 1116	128	fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe	80
PID 128 wrote to memory of 1116	128	fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe	80
PID 128 wrote to memory of 1116	128	fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe	80
PID 128 wrote to memory of 1116	128	fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe	80
PID 128 wrote to memory of 1116	128	fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe	80
PID 128 wrote to memory of 1116	128	fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe	80
PID 1116 wrote to memory of 1828	1116	kat6C08.tmp	82
PID 1116 wrote to memory of 1828	1116	kat6C08.tmp	82
PID 1116 wrote to memory of 1828	1116	kat6C08.tmp	82
PID 1828 wrote to memory of 4960	1828	cmd.exe	84
PID 1828 wrote to memory of 4960	1828	cmd.exe	84
PID 1828 wrote to memory of 4960	1828	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe
"C:\Users\Admin\AppData\Local\Temp\fc16fb413e724e1062fa1834242b4e401a205f4e670e8160dea6009817504ef1.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:128
- C:\Users\Admin\AppData\Local\Temp\kat6C08.tmp
  C:\Users\Admin\AppData\Local\Temp\kat6C08.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1116
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat6C08.tmp" & rd /s /q "C:\ProgramData\ECFCBFBGDBKJ" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1828
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:4960

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

kat6C08.tmp

Path C:\Users\Admin\AppData\Local\Temp\kat6C08.tmp
Size 861KB
SHA256 6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795
MD5 66064dbdb70a5eb15ebf3bf65aba254b
SHA1 0284fd320f99f62aca800fb1251eff4c31ec4ed7
SHA512 b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f
SSDEEP 24576:o0ESdQpglO1CxDyawn27h+9hrlgKQY9SGcZwCdTp:o0RIglO1CuL9VNcaCd9
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/128-9-0x0000000000400000-0x000000000067A000-memory.dmp

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memory/128-2-0x0000000002BF0000-0x0000000002D53000-memory.dmp

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memory/128-0-0x00000000023D0000-0x00000000023D1000-memory.dmp

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memory/1116-16-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-10-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-4-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-15-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-8-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-18-0x000000001B8A0000-0x000000001BAFF000-memory.dmp

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memory/1116-33-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-34-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-50-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-51-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-62-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-63-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1116-66-0x0000000000400000-0x0000000000648000-memory.dmp

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