stealc | c13570205fe6d7efb3e6c8435740e0569d5e2feea1691f00ee51d64dac082441

Analysis

max time kernel
138s
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
17/05/2024, 03:16

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General

Target
80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe
Size 374KB
Sample240517-dsl9caeg71
SHA256 80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca
MD5 b580ff2d001291bf58bdd23a058ef21b
SHA1 5013dc6e38bd9d1cbe2f7fc0d983b6812f3f2351
SHA512 85643ff028ffa0d7c6e7b3dd69c9316aed5e6c15c364bfdb14ec65ca9859ee8fb2ae04e3990c2275671da27abb727a9505f2acf5453a4bb1a3f4df0664df603b
SSDEEP 6144:3hp+scz0+j/2LXudxnOqC3dFxYkBY8EdltIPaiTeUkHjUP6PiLNwETfeuBMbxFr9:3SscQu/CLtF3BY87PFi7HJAwETfhMlF5
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Signatures

Detect Vidar Stealer 13 IoCs

stealer

resource	yara_rule
behavioral2/memory/1308-2-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-7-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-5-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-11-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-12-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-29-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-30-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-39-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-46-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-54-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-55-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-66-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/1308-67-0x0000000000400000-0x0000000000646000-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-1-5-21-1181767204-2009306918-3718769404-1000\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 2796 set thread context of 1308	2796	80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe	93

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
4540	timeout.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe
1308	RegAsm.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2796 wrote to memory of 1308	2796	80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe	93
PID 2796 wrote to memory of 1308	2796	80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe	93
PID 2796 wrote to memory of 1308	2796	80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe	93
PID 2796 wrote to memory of 1308	2796	80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe	93
PID 2796 wrote to memory of 1308	2796	80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe	93
PID 2796 wrote to memory of 1308	2796	80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe	93
PID 2796 wrote to memory of 1308	2796	80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe	93
PID 2796 wrote to memory of 1308	2796	80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe	93
PID 2796 wrote to memory of 1308	2796	80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe	93
PID 1308 wrote to memory of 2268	1308	RegAsm.exe	108
PID 1308 wrote to memory of 2268	1308	RegAsm.exe	108
PID 1308 wrote to memory of 2268	1308	RegAsm.exe	108
PID 2268 wrote to memory of 4540	2268	cmd.exe	110
PID 2268 wrote to memory of 4540	2268	cmd.exe	110
PID 2268 wrote to memory of 4540	2268	cmd.exe	110

C:\Users\Admin\AppData\Local\Temp\80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe
"C:\Users\Admin\AppData\Local\Temp\80994b791b545ba6a8c906e046ab6ae79c5875a4f42da07085113b4b6f22f8ca.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2796
- 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:1308
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\CFCBAAEBKEGH" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2268
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:4540

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=4212,i,14486271492189381216,15799931579469722648,262144 --variations-seed-version --mojo-platform-channel-handle=3788 /prefetch:8
1⤵
PID:5060

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 --field-trial-handle=3568,i,14486271492189381216,15799931579469722648,262144 --variations-seed-version --mojo-platform-channel-handle=2632 /prefetch:3
1⤵
PID:4248

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

SCT Auditing Pending Reports

Path C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Network\SCT Auditing Pending Reports
Size 2B
SHA256 4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945
MD5 d751713988987e9331980363e24189ce
SHA1 97d170e1550eee4afc0af065b78cda302a97674c
SHA512 b25b294cb4deb69ea00a4c3cf3113904801b6015e5956bd019a8570b1fe1d6040e944ef3cdee16d0a46503ca6e659a25f21cf9ceddc13f352a3c98138c15d6af
MD5 SHA1 SHA512

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Sdch Dictionaries

Path C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Network\Sdch Dictionaries
Size 40B
SHA256 6028bd681dbf11a0a58dde8a0cd884115c04caa59d080ba51bde1b086ce0079d
MD5 20d4b8fa017a12a108c87f540836e250
SHA1 1ac617fac131262b6d3ce1f52f5907e31d5f6f00
SHA512 507b2b8a8a168ff8f2bdafa5d9d341c44501a5f17d9f63f3d43bd586bc9e8ae33221887869fa86f845b7d067cb7d2a7009efd71dda36e03a40a74fee04b86856
MD5 SHA1 SHA512

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memory/1308-7-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-39-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-67-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-5-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-11-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-12-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-14-0x000000001B2C0000-0x000000001B51F000-memory.dmp

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memory/1308-29-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-30-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-2-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-66-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-46-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-54-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/1308-55-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/2796-3-0x0000000001380000-0x0000000001381000-memory.dmp

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memory/2796-0-0x0000000001380000-0x0000000001381000-memory.dmp

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memory/2796-1-0x0000000001380000-0x0000000001381000-memory.dmp

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