stealc | b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22

Analysis

max time kernel
90s
max time network
91s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
09/06/2024, 20:04

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General

Target
b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe
Size 2.4MB
Sample240609-ytcfrafa88
SHA256 b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22
MD5 6b09639a706300e0a73c181c4682ff65
SHA1 173bb0b2160754c0e504944195506c9f09aa735a
SHA512 04c958d477618af745f6b5cc8cb28c401d8bf6b41d6bcb02986921dbb7984829b74696b84f47d058e5cd0312fa04aa64a46fe4bd1907d33e77216d60dbaef789
SSDEEP 49152:L78Cw52xsz+08sEAQACR07Q3byRD8aXY658:g52xsz+08fAw07QLyLn
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 8 IoCs

stealer

resource	yara_rule
behavioral2/memory/1404-1-0x0000000002B00000-0x0000000002C63000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-9-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-15-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-16-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-33-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-34-0x0000000000400000-0x0000000000648000-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
1308	kat51BA.tmp

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
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 1404 set thread context of 1308	1404	b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe	80

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	kat51BA.tmp

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1308	kat51BA.tmp
1308	kat51BA.tmp

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1404 wrote to memory of 1308	1404	b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe	80
PID 1404 wrote to memory of 1308	1404	b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe	80
PID 1404 wrote to memory of 1308	1404	b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe	80
PID 1404 wrote to memory of 1308	1404	b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe	80
PID 1404 wrote to memory of 1308	1404	b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe	80
PID 1404 wrote to memory of 1308	1404	b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe	80
PID 1404 wrote to memory of 1308	1404	b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe	80
PID 1404 wrote to memory of 1308	1404	b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe	80

C:\Users\Admin\AppData\Local\Temp\b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe
"C:\Users\Admin\AppData\Local\Temp\b5a54a7ae1f929a94736bc07e4490c68ac163c18881c69c004a96d9e60c42a22.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1404
- C:\Users\Admin\AppData\Local\Temp\kat51BA.tmp
  C:\Users\Admin\AppData\Local\Temp\kat51BA.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:1308

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

Replay Monitor

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Downloads

kat51BA.tmp

Path C:\Users\Admin\AppData\Local\Temp\kat51BA.tmp
Size 861KB
SHA256 6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795
MD5 66064dbdb70a5eb15ebf3bf65aba254b
SHA1 0284fd320f99f62aca800fb1251eff4c31ec4ed7
SHA512 b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f
SSDEEP 24576:o0ESdQpglO1CxDyawn27h+9hrlgKQY9SGcZwCdTp:o0RIglO1CuL9VNcaCd9
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1308-8-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1308-9-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1308-4-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1308-15-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1308-16-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1308-19-0x00000000193D0000-0x000000001962F000-memory.dmp

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memory/1308-33-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1308-34-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1404-0-0x00000000024D0000-0x00000000024D1000-memory.dmp

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memory/1404-1-0x0000000002B00000-0x0000000002C63000-memory.dmp

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memory/1404-10-0x0000000000400000-0x0000000000663000-memory.dmp

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