stealc | 0c9d401e9b393d2e7e2e3c727ba6e3e83cde22df260731879a4e5b0350929574

General

Target

file.exe
Size

355KB
MD5

d79b788762c6435ae9f599743f9f482d
SHA1

4d96933a654c426776b30b57b49227e812b3d231
SHA256

0c9d401e9b393d2e7e2e3c727ba6e3e83cde22df260731879a4e5b0350929574
SHA512

e6e3a3be1c171b38a9b167291d2f875c169c04b0aefe7425092301cdb694c2c052fdc30e770634634c82ca3cca76507e20d0aff1ea6db9076299e10935bb39f9
SSDEEP

6144:hKrTm/Wop3oiUklM540oF1zTuoZxFrI/l2k9Joup1JgHEa23sw6ac:8rTm/WohfdFNhhGpIOcYc

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 11 IoCs

stealer

resource	yara_rule
behavioral2/memory/2608-2-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2608-5-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2608-7-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2608-16-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2608-17-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2608-34-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2608-35-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2608-51-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2608-58-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2608-69-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2608-70-0x0000000000400000-0x0000000000646000-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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	RegAsm.exe

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 4544 set thread context of 2608	4544	file.exe	91

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	RegAsm.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2096	timeout.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
2608	RegAsm.exe
2608	RegAsm.exe
2608	RegAsm.exe
2608	RegAsm.exe
2608	RegAsm.exe
2608	RegAsm.exe
2608	RegAsm.exe
2608	RegAsm.exe
2608	RegAsm.exe
2608	RegAsm.exe
2608	RegAsm.exe
2608	RegAsm.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4544 wrote to memory of 2608	4544	file.exe	91
PID 4544 wrote to memory of 2608	4544	file.exe	91
PID 4544 wrote to memory of 2608	4544	file.exe	91
PID 4544 wrote to memory of 2608	4544	file.exe	91
PID 4544 wrote to memory of 2608	4544	file.exe	91
PID 4544 wrote to memory of 2608	4544	file.exe	91
PID 4544 wrote to memory of 2608	4544	file.exe	91
PID 4544 wrote to memory of 2608	4544	file.exe	91
PID 4544 wrote to memory of 2608	4544	file.exe	91
PID 2608 wrote to memory of 1256	2608	RegAsm.exe	100
PID 2608 wrote to memory of 1256	2608	RegAsm.exe	100
PID 2608 wrote to memory of 1256	2608	RegAsm.exe	100
PID 1256 wrote to memory of 2096	1256	cmd.exe	102
PID 1256 wrote to memory of 2096	1256	cmd.exe	102
PID 1256 wrote to memory of 2096	1256	cmd.exe	102

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4544
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Checks computer location settings
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2608
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\FHJDGHIJDGCB" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1256
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:2096

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-appcompat-clear --mojo-platform-channel-handle=3752 --field-trial-handle=2248,i,10247514684337323751,15511974759131734137,262144 --variations-seed-version /prefetch:3
1⤵
PID:4028

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 --mojo-platform-channel-handle=2952 --field-trial-handle=2248,i,10247514684337323751,15511974759131734137,262144 --variations-seed-version /prefetch:8
1⤵
PID:4136

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\Microsoft\Edge\User Data\Default\Network\SCT Auditing Pending Reports

Filesize
2B

MD5
d751713988987e9331980363e24189ce

SHA1
97d170e1550eee4afc0af065b78cda302a97674c

SHA256
4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945

SHA512
b25b294cb4deb69ea00a4c3cf3113904801b6015e5956bd019a8570b1fe1d6040e944ef3cdee16d0a46503ca6e659a25f21cf9ceddc13f352a3c98138c15d6af

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Network\Sdch Dictionaries

Filesize
40B

MD5
20d4b8fa017a12a108c87f540836e250

SHA1
1ac617fac131262b6d3ce1f52f5907e31d5f6f00

SHA256
6028bd681dbf11a0a58dde8a0cd884115c04caa59d080ba51bde1b086ce0079d

SHA512
507b2b8a8a168ff8f2bdafa5d9d341c44501a5f17d9f63f3d43bd586bc9e8ae33221887869fa86f845b7d067cb7d2a7009efd71dda36e03a40a74fee04b86856

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memory/2608-5-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2608-34-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2608-70-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2608-7-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2608-16-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2608-17-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2608-19-0x000000001E0F0000-0x000000001E34F000-memory.dmp

Filesize
2.4MB

Download
memory/2608-2-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2608-35-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2608-51-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2608-69-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2608-58-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4544-3-0x0000000000390000-0x0000000000391000-memory.dmp

Filesize
4KB

Download
memory/4544-0-0x0000000000390000-0x0000000000391000-memory.dmp

Filesize
4KB

Download
memory/4544-1-0x0000000000390000-0x0000000000391000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads