stealc | 6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16

Analysis

max time kernel
143s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
12/06/2024, 04:28

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General

Target
6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe
Size 1.6MB
Sample240612-e343ks1brr
SHA256 6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16
MD5 b8d5a62bb502b76783342c24da1ca17e
SHA1 8eb62240069911c8e4393e8e4e88a38cb8a7840a
SHA512 4449e211e3c92c37fe8e6163ea359d9d87f020879b2a3992800276b5248baf484772f0dbf9cc7cf4a3503d120bbc1d4504a2f0be8bc5f62bffa02f0bdf4230fa
SSDEEP 24576:spM5863IGfTAVpalBtUfMxVVtes12FxwojKr98YGeGG9i:spQLYkTYp6BtUkxVVChjHZQs
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 9 IoCs

stealer

resource	yara_rule
behavioral1/memory/3368-1-0x00000000028D0000-0x00000000029E0000-memory.dmp	family_vidar_v7
behavioral1/memory/2216-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2216-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2216-10-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2216-11-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2216-12-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2216-13-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2216-14-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/2216-17-0x0000000000400000-0x0000000000648000-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

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	katEB89.tmp

Executes dropped EXE 1 IoCs

pid	Process
2216	katEB89.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
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 3368 set thread context of 2216	3368	6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe	92

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	katEB89.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4428	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2216	katEB89.tmp
2216	katEB89.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3368 wrote to memory of 2216	3368	6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe	92
PID 3368 wrote to memory of 2216	3368	6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe	92
PID 3368 wrote to memory of 2216	3368	6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe	92
PID 3368 wrote to memory of 2216	3368	6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe	92
PID 3368 wrote to memory of 2216	3368	6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe	92
PID 3368 wrote to memory of 2216	3368	6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe	92
PID 3368 wrote to memory of 2216	3368	6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe	92
PID 3368 wrote to memory of 2216	3368	6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe	92
PID 2216 wrote to memory of 3272	2216	katEB89.tmp	96
PID 2216 wrote to memory of 3272	2216	katEB89.tmp	96
PID 2216 wrote to memory of 3272	2216	katEB89.tmp	96
PID 3272 wrote to memory of 4428	3272	cmd.exe	98
PID 3272 wrote to memory of 4428	3272	cmd.exe	98
PID 3272 wrote to memory of 4428	3272	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe
"C:\Users\Admin\AppData\Local\Temp\6a22ea21d33d8baef1406631dddce552822102d2e0e4c5e29beb2853cf01ed16.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3368
- C:\Users\Admin\AppData\Local\Temp\katEB89.tmp
  C:\Users\Admin\AppData\Local\Temp\katEB89.tmp
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2216
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\katEB89.tmp" & rd /s /q "C:\ProgramData\FHCBGIIJKEBF" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3272
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:4428

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=3144,i,1697479186275492802,18058102846092193784,262144 --variations-seed-version --mojo-platform-channel-handle=4404 /prefetch:8
1⤵
PID:2604

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

katEB89.tmp

Path C:\Users\Admin\AppData\Local\Temp\katEB89.tmp
Size 861KB
SHA256 6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795
MD5 66064dbdb70a5eb15ebf3bf65aba254b
SHA1 0284fd320f99f62aca800fb1251eff4c31ec4ed7
SHA512 b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f
SSDEEP 24576:o0ESdQpglO1CxDyawn27h+9hrlgKQY9SGcZwCdTp:o0RIglO1CuL9VNcaCd9
MD5 SHA1 SHA512 SSDEEP

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memory/2216-8-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2216-4-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2216-10-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2216-11-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2216-12-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2216-13-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2216-14-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2216-17-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/3368-0-0x00000000022E0000-0x00000000022E1000-memory.dmp

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memory/3368-1-0x00000000028D0000-0x00000000029E0000-memory.dmp

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memory/3368-9-0x0000000000400000-0x0000000000594000-memory.dmp

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