stealc | 019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9

Resubmissions

23-05-2024 18:23

240523-w1kdtsbg43 10

Analysis

max time kernel
134s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
23-05-2024 18:23

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General

Target

019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe
Size

2.4MB
MD5

aa088db2fb11c45957afc3e0eddabe43
SHA1

72b6dfad9d46a341b3f51601e687fd1e30796621
SHA256

019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9
SHA512

48d03d6977a0c4b533ae924a9319a280fd2f6952e62d4872ec3abd56245238137258aeda1f7dc04c53e006b9caf78b63bb21acad94474efcd6e77f34e59967ac
SSDEEP

49152:jxIRJF1HL+VdX68kUqJtTF+TxMoxc1TU+j+dAzGwlrh:jEJF16dX68dqtIuoITsdZ

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

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/4852-2-0x0000000004050000-0x0000000004199000-memory.dmp	family_vidar_v7
behavioral1/memory/3412-8-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3412-9-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3412-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3412-14-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3412-15-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3412-32-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/3412-33-0x0000000000400000-0x0000000000646000-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:

kat4798.tmp

pid process

3412 kat4798.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
3412	kat4798.tmp

Suspicious use of SetThreadContext 1 IoCs

Processes:

019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe

description	pid	process	target process
PID 4852 set thread context of 3412	4852	019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe	kat4798.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:

kat4798.tmp

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString kat4798.tmp
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

kat4798.tmp

pid process

3412 kat4798.tmp
3412 kat4798.tmp

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat4798.tmp

pid	process
3412	kat4798.tmp
3412	kat4798.tmp

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe

description	pid	process	target process
PID 4852 wrote to memory of 3412	4852	019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe	kat4798.tmp
PID 4852 wrote to memory of 3412	4852	019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe	kat4798.tmp
PID 4852 wrote to memory of 3412	4852	019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe	kat4798.tmp
PID 4852 wrote to memory of 3412	4852	019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe	kat4798.tmp
PID 4852 wrote to memory of 3412	4852	019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe	kat4798.tmp
PID 4852 wrote to memory of 3412	4852	019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe	kat4798.tmp
PID 4852 wrote to memory of 3412	4852	019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe	kat4798.tmp
PID 4852 wrote to memory of 3412	4852	019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe	kat4798.tmp

C:\Users\Admin\AppData\Local\Temp\019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe
"C:\Users\Admin\AppData\Local\Temp\019defb00ac70b5260d5b7c3c8b0b477d4953bc5bac8f42fbec4d7e4aaff72e9.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4852
- C:\Users\Admin\AppData\Local\Temp\kat4798.tmp
  C:\Users\Admin\AppData\Local\Temp\kat4798.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:3412

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat4798.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/3412-8-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3412-9-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3412-4-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3412-14-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3412-15-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3412-17-0x000000001B7F0000-0x000000001BA4F000-memory.dmp

Filesize
2.4MB

Download
memory/3412-32-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/3412-33-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4852-0-0x00000000022D0000-0x00000000022D1000-memory.dmp

Filesize
4KB

Download
memory/4852-2-0x0000000004050000-0x0000000004199000-memory.dmp

Filesize
1.3MB

Download
memory/4852-10-0x0000000000400000-0x0000000000678000-memory.dmp

Filesize
2.5MB

Download