stealc | a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929

General

Target

a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe
Size

2.1MB
MD5

8b07c9cd663c4a2cde283fe89ad7b46f
SHA1

10773275a855a541c405cff8609cac0a383c2ea7
SHA256

a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929
SHA512

c678be50d00999d7648639f6ef90c3214b55a6660d4dfdc2299f66ae0812398ca302af3cedc69f072beca7575bb310ec880f9526319d3142d319e0ff31f23401
SSDEEP

49152:N6uDuaS9refuoJtTF+TxMoxc1TU+j+dAzGkiT:N6uKb9LotIuoITsdZT

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Signatures

Detect Vidar Stealer 8 IoCs

stealer

resource	yara_rule
behavioral2/memory/1368-1-0x0000000004120000-0x0000000004269000-memory.dmp	family_vidar_v7
behavioral2/memory/4316-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4316-8-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4316-9-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4316-16-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4316-17-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4316-34-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4316-35-0x0000000000400000-0x0000000000646000-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

pid	Process
4316	kat58ED.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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1368 set thread context of 4316	1368	a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe	80

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	kat58ED.tmp

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4316	kat58ED.tmp
4316	kat58ED.tmp

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1368 wrote to memory of 4316	1368	a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe	80
PID 1368 wrote to memory of 4316	1368	a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe	80
PID 1368 wrote to memory of 4316	1368	a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe	80
PID 1368 wrote to memory of 4316	1368	a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe	80
PID 1368 wrote to memory of 4316	1368	a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe	80
PID 1368 wrote to memory of 4316	1368	a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe	80
PID 1368 wrote to memory of 4316	1368	a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe	80
PID 1368 wrote to memory of 4316	1368	a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe	80

C:\Users\Admin\AppData\Local\Temp\a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe
"C:\Users\Admin\AppData\Local\Temp\a99f63856e1cf5a71efb4bba1cd1ffbbc10434519369eaf275cad6d6dcf4e929.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1368
- C:\Users\Admin\AppData\Local\Temp\kat58ED.tmp
  C:\Users\Admin\AppData\Local\Temp\kat58ED.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:4316

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\kat58ED.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/1368-0-0x0000000002370000-0x0000000002371000-memory.dmp

Filesize
4KB

Download
memory/1368-1-0x0000000004120000-0x0000000004269000-memory.dmp

Filesize
1.3MB

Download
memory/1368-10-0x0000000000400000-0x000000000061C000-memory.dmp

Filesize
2.1MB

Download
memory/4316-4-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4316-8-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4316-9-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4316-16-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4316-17-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4316-20-0x00000000193F0000-0x000000001964F000-memory.dmp

Filesize
2.4MB

Download
memory/4316-34-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4316-35-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download

Analysis

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