stealc | 85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b

General

Target

85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe
Size

1.8MB
MD5

b7a957e443f918c52924b35675267d4c
SHA1

f2fcdba4dc26da2f17633f85d43244c8f473ae40
SHA256

85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b
SHA512

fd67d70b83fdd5d53d223cb232e247ce862b9ca9cabbae4f26637adab0a2310265b8169d5d2b1b71065d95c4096c796dfc0b5f4e259d94eacef01b3f68b6dcb6
SSDEEP

24576:l6z6AnPq5iak02HkPYaOV+rEfv0xwT3zxNOt4XigDSCuptNIeUaKUqm1zE:wer5l4kPYa8aesY3Ot4N7G/IeUAtK

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

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 13 IoCs

stealer

resource	yara_rule
behavioral1/memory/3224-2-0x0000000002970000-0x0000000002ABB000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-10-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-13-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-14-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-31-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-32-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-48-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-49-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-63-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-64-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral1/memory/3376-65-0x0000000000400000-0x0000000000648000-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

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-1-5-21-540404634-651139247-2967210625-1000\Control Panel\International\Geo\Nation	kat606F.tmp

Executes dropped EXE 1 IoCs

pid	Process
3376	kat606F.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
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 3224 set thread context of 3376	3224	85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe	89

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	kat606F.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2736	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3376	kat606F.tmp
3376	kat606F.tmp
3376	kat606F.tmp
3376	kat606F.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3224 wrote to memory of 3376	3224	85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe	89
PID 3224 wrote to memory of 3376	3224	85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe	89
PID 3224 wrote to memory of 3376	3224	85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe	89
PID 3224 wrote to memory of 3376	3224	85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe	89
PID 3224 wrote to memory of 3376	3224	85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe	89
PID 3224 wrote to memory of 3376	3224	85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe	89
PID 3224 wrote to memory of 3376	3224	85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe	89
PID 3224 wrote to memory of 3376	3224	85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe	89
PID 3376 wrote to memory of 2920	3376	kat606F.tmp	92
PID 3376 wrote to memory of 2920	3376	kat606F.tmp	92
PID 3376 wrote to memory of 2920	3376	kat606F.tmp	92
PID 2920 wrote to memory of 2736	2920	cmd.exe	94
PID 2920 wrote to memory of 2736	2920	cmd.exe	94
PID 2920 wrote to memory of 2736	2920	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe
"C:\Users\Admin\AppData\Local\Temp\85dc37f498f535f3b98e1b0b213c671703b093fb1156be730693161f268a599b.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3224
- C:\Users\Admin\AppData\Local\Temp\kat606F.tmp
  C:\Users\Admin\AppData\Local\Temp\kat606F.tmp
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:3376
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat606F.tmp" & rd /s /q "C:\ProgramData\IJKFHDBKFCAA" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2920
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:2736

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

3

T1552

Credentials In Files

3

T1552.001

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

3

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat606F.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/3224-9-0x0000000000400000-0x00000000005C8000-memory.dmp

Filesize
1.8MB

Download
memory/3224-2-0x0000000002970000-0x0000000002ABB000-memory.dmp

Filesize
1.3MB

Download
memory/3224-0-0x0000000002340000-0x0000000002341000-memory.dmp

Filesize
4KB

Download
memory/3376-14-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-8-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-10-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-13-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-4-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-31-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-16-0x000000001B740000-0x000000001B99F000-memory.dmp

Filesize
2.4MB

Download
memory/3376-32-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-48-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-49-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-63-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-64-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download
memory/3376-65-0x0000000000400000-0x0000000000648000-memory.dmp

Filesize
2.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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