stealc | fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577

General

Target

fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe
Size

2.0MB
MD5

8adfeaf08bf097503169c6062a0d7607
SHA1

07a4644db9a01a5aab486ad4677cef70d0d86baa
SHA256

fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577
SHA512

23d27e5c989d3d4083ad2bb5391562219374bcc7a818b746cff2b8905026b8b92637700196390c51426eb140c89c2fb72989237179dc79da4ae399c90c0b8c3e
SSDEEP

49152:s4K3x1vUCJtTF+TxMoxc1TU+j+dAzGwlrh:s4Ex18CtIuoITsdZ

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 14 IoCs

stealer

resource	yara_rule
behavioral1/memory/448-2-0x0000000004030000-0x0000000004179000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-9-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-10-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-17-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-18-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-35-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-52-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-48-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-59-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-65-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-66-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-67-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4496-68-0x0000000000400000-0x0000000000646000-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-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation	kat5081.tmp

Executes dropped EXE 1 IoCs

pid	Process
4496	kat5081.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 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 448 set thread context of 4496	448	fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe	83

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	kat5081.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
992	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4496	kat5081.tmp
4496	kat5081.tmp
4496	kat5081.tmp
4496	kat5081.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 448 wrote to memory of 4496	448	fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe	83
PID 448 wrote to memory of 4496	448	fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe	83
PID 448 wrote to memory of 4496	448	fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe	83
PID 448 wrote to memory of 4496	448	fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe	83
PID 448 wrote to memory of 4496	448	fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe	83
PID 448 wrote to memory of 4496	448	fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe	83
PID 448 wrote to memory of 4496	448	fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe	83
PID 448 wrote to memory of 4496	448	fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe	83
PID 4496 wrote to memory of 3248	4496	kat5081.tmp	98
PID 4496 wrote to memory of 3248	4496	kat5081.tmp	98
PID 4496 wrote to memory of 3248	4496	kat5081.tmp	98
PID 3248 wrote to memory of 992	3248	cmd.exe	100
PID 3248 wrote to memory of 992	3248	cmd.exe	100
PID 3248 wrote to memory of 992	3248	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe
"C:\Users\Admin\AppData\Local\Temp\fc17f100ef27bc519c0b7f4db558709f7d558723c1a67c7a6cfab7217ef39577.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:448
- C:\Users\Admin\AppData\Local\Temp\kat5081.tmp
  C:\Users\Admin\AppData\Local\Temp\kat5081.tmp
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4496
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat5081.tmp" & rd /s /q "C:\ProgramData\CAKKJKKECFID" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3248
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:992

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\Temp\kat5081.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/448-6-0x0000000000400000-0x000000000060C000-memory.dmp

Filesize
2.0MB

Download
memory/448-2-0x0000000004030000-0x0000000004179000-memory.dmp

Filesize
1.3MB

Download
memory/448-0-0x0000000002260000-0x0000000002261000-memory.dmp

Filesize
4KB

Download
memory/4496-18-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-52-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-10-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-17-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-4-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-21-0x000000001B810000-0x000000001BA6F000-memory.dmp

Filesize
2.4MB

Download
memory/4496-35-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-9-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-48-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-59-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-65-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-66-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-67-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4496-68-0x0000000000400000-0x0000000000646000-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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Downloads