stealc | f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de

Analysis

max time kernel
46s
max time network
57s
platform
windows11-21h2_x64
resource
win11-20240419-en
resource tags

arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
submitted
12/06/2024, 01:43

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General

Target
f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe
Size 1.6MB
Sample240612-b5ph5ayapn
SHA256 f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de
MD5 16143236b777136b9310a0f1a7712210
SHA1 f49ad385e54a60b67a56aa73f54204b0b327f72d
SHA512 3a814e55aa4ec7e0f099463a0b103819e64baf814278c6ed06a4dc87db0c17c66757dc0c96b239e1657a6f538a8a5d265af0af058166f82b6bd770d5b27a15b0
SSDEEP 24576:spM5863IGfTAVpalBjUfMxVVtes12FxwojKr98YGeGG9i:spQLYkTYp6BjUkxVVChjHZQs
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
behavioral2/memory/4048-2-0x0000000003FB0000-0x00000000040C0000-memory.dmp	family_vidar_v7
behavioral2/memory/1312-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1312-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1312-9-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1312-11-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1312-12-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1312-13-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1312-14-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1312-15-0x0000000000400000-0x0000000000648000-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

Executes dropped EXE 1 IoCs

pid	Process
1312	kat5302.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 4048 set thread context of 1312	4048	f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe	78

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	kat5302.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2972	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1312	kat5302.tmp
1312	kat5302.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4048 wrote to memory of 1312	4048	f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe	78
PID 4048 wrote to memory of 1312	4048	f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe	78
PID 4048 wrote to memory of 1312	4048	f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe	78
PID 4048 wrote to memory of 1312	4048	f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe	78
PID 4048 wrote to memory of 1312	4048	f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe	78
PID 4048 wrote to memory of 1312	4048	f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe	78
PID 4048 wrote to memory of 1312	4048	f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe	78
PID 4048 wrote to memory of 1312	4048	f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe	78
PID 1312 wrote to memory of 2236	1312	kat5302.tmp	80
PID 1312 wrote to memory of 2236	1312	kat5302.tmp	80
PID 1312 wrote to memory of 2236	1312	kat5302.tmp	80
PID 2236 wrote to memory of 2972	2236	cmd.exe	82
PID 2236 wrote to memory of 2972	2236	cmd.exe	82
PID 2236 wrote to memory of 2972	2236	cmd.exe	82

C:\Users\Admin\AppData\Local\Temp\f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe
"C:\Users\Admin\AppData\Local\Temp\f03e3506bca72e7a4e6b57e0e1aa4483213226d72172f64f40b01819e55a50de.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4048
- C:\Users\Admin\AppData\Local\Temp\kat5302.tmp
  C:\Users\Admin\AppData\Local\Temp\kat5302.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1312
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat5302.tmp" & rd /s /q "C:\ProgramData\EBGCFBGCBFHJ" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2236
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:2972

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

kat5302.tmp

Path C:\Users\Admin\AppData\Local\Temp\kat5302.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/1312-4-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1312-8-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1312-9-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1312-11-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1312-12-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1312-13-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1312-14-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1312-15-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4048-0-0x0000000000840000-0x0000000000841000-memory.dmp

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memory/4048-2-0x0000000003FB0000-0x00000000040C0000-memory.dmp

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memory/4048-10-0x0000000000400000-0x0000000000594000-memory.dmp

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