stealc | f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d

General

Target

f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe
Size

1.9MB
MD5

922db66f23a1078214f6558c0d8965e7
SHA1

c5ebcbdd396d3fd1f39b8cdd2a65d1537732e2a8
SHA256

f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d
SHA512

1873edab727e7a3b36b65c33a4a20d6e09b63b073531358ec44e5f2a762f956101d6898ad8603abfeca7b56e052909241eacb8f59f3d96ea1eabf656b63b638f
SSDEEP

49152:CdKfTn6vaJtTF+TxMoxc1TU+j+dAzGwlrh:CdKfTnZtIuoITsdZ

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 8 IoCs

stealer

Processes:

resource	yara_rule
behavioral1/memory/3676-2-0x0000000004150000-0x0000000004299000-memory.dmp	family_vidar_v7
behavioral1/memory/4064-8-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4064-9-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4064-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4064-14-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4064-15-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4064-32-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/4064-33-0x0000000000400000-0x0000000000646000-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
Executes dropped EXE 1 IoCs

Processes:

kat421A.tmp

pid process

4064 kat421A.tmp
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
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

pid	process
4064	kat421A.tmp

Suspicious use of SetThreadContext 1 IoCs

Processes:

f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe

description	pid	process	target process
PID 3676 set thread context of 4064	3676	f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe	kat421A.tmp

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

Processes:

kat421A.tmp

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString kat421A.tmp
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

kat421A.tmp

pid process

4064 kat421A.tmp
4064 kat421A.tmp

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat421A.tmp

pid	process
4064	kat421A.tmp
4064	kat421A.tmp

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe

description	pid	process	target process
PID 3676 wrote to memory of 4064	3676	f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe	kat421A.tmp
PID 3676 wrote to memory of 4064	3676	f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe	kat421A.tmp
PID 3676 wrote to memory of 4064	3676	f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe	kat421A.tmp
PID 3676 wrote to memory of 4064	3676	f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe	kat421A.tmp
PID 3676 wrote to memory of 4064	3676	f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe	kat421A.tmp
PID 3676 wrote to memory of 4064	3676	f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe	kat421A.tmp
PID 3676 wrote to memory of 4064	3676	f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe	kat421A.tmp
PID 3676 wrote to memory of 4064	3676	f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe	kat421A.tmp

C:\Users\Admin\AppData\Local\Temp\f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe
"C:\Users\Admin\AppData\Local\Temp\f4df88e775aa88a50943d435ab5cfc6d999ba1e11d310e635ca57eeb7b565e6d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3676

C:\Users\Admin\AppData\Local\Temp\kat421A.tmp
C:\Users\Admin\AppData\Local\Temp\kat421A.tmp
2⤵
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
PID:4064

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat421A.tmp
Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/3676-0-0x0000000000770000-0x0000000000771000-memory.dmp

Filesize
4KB

Download
memory/3676-2-0x0000000004150000-0x0000000004299000-memory.dmp

Filesize
1.3MB

Download
memory/3676-10-0x0000000000400000-0x00000000005EC000-memory.dmp

Filesize
1.9MB

Download
memory/4064-8-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4064-9-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4064-4-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4064-14-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4064-15-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4064-17-0x000000001B7A0000-0x000000001B9FF000-memory.dmp

Filesize
2.4MB

Download
memory/4064-32-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4064-33-0x0000000000400000-0x0000000000646000-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