stealc | 67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa

Analysis

max time kernel
134s
max time network
127s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
07/06/2024, 03:35

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General

Target
67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe
Size 2.9MB
Sample240607-d5fx4aab68
SHA256 67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa
MD5 3765f2522f3544aa1fadef36a62c0c09
SHA1 c550eac426af9007e0ccec9c879021cc408e17d7
SHA512 7ed7ede8897f65339732b705f950134ac4e2a3d2ee1aab3e29d50ed5c2894b473b9a798fb2218704a9f852f93c89fd34c19e48f074f381d839e4dd426076ba11
SSDEEP 49152:rtpSxptE1AKnCtMS4cdR/z4+UVi4e9Crn:r/4nE1dCiKxx4e9Cb
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
behavioral1/memory/2988-9-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2988-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2988-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3968-3-0x0000000002BD0000-0x0000000002D36000-memory.dmp	family_vidar_v7
behavioral1/memory/2988-13-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2988-14-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2988-31-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2988-32-0x0000000000400000-0x0000000000648000-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
2988	katE9D3.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 3968 set thread context of 2988	3968	67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe	91

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	katE9D3.tmp

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2988	katE9D3.tmp
2988	katE9D3.tmp

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3968 wrote to memory of 2988	3968	67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe	91
PID 3968 wrote to memory of 2988	3968	67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe	91
PID 3968 wrote to memory of 2988	3968	67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe	91
PID 3968 wrote to memory of 2988	3968	67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe	91
PID 3968 wrote to memory of 2988	3968	67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe	91
PID 3968 wrote to memory of 2988	3968	67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe	91
PID 3968 wrote to memory of 2988	3968	67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe	91
PID 3968 wrote to memory of 2988	3968	67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe	91

C:\Users\Admin\AppData\Local\Temp\67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe
"C:\Users\Admin\AppData\Local\Temp\67fbf8993a834461d0dccdad8dc8190e6851d280286e322fedc13cef37f6c5fa.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3968
- C:\Users\Admin\AppData\Local\Temp\katE9D3.tmp
  C:\Users\Admin\AppData\Local\Temp\katE9D3.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:2988

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=1316,i,17096020621006928097,15544233752327415349,262144 --variations-seed-version --mojo-platform-channel-handle=4312 /prefetch:8
1⤵
PID:768

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

katE9D3.tmp

Path C:\Users\Admin\AppData\Local\Temp\katE9D3.tmp
Size 861KB
SHA256 6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795
MD5 66064dbdb70a5eb15ebf3bf65aba254b
SHA1 0284fd320f99f62aca800fb1251eff4c31ec4ed7
SHA512 b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f
SSDEEP 24576:o0ESdQpglO1CxDyawn27h+9hrlgKQY9SGcZwCdTp:o0RIglO1CuL9VNcaCd9
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/2988-9-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2988-8-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2988-4-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2988-13-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2988-14-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2988-16-0x000000001B740000-0x000000001B99F000-memory.dmp

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memory/2988-31-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2988-32-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/3968-0-0x00000000024A0000-0x00000000024A1000-memory.dmp

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memory/3968-10-0x0000000000400000-0x00000000006EF000-memory.dmp

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memory/3968-3-0x0000000002BD0000-0x0000000002D36000-memory.dmp

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