stealc | bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45

General

Target

bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe
Size

2.0MB
MD5

bb874688b123e8843616a022dff6720e
SHA1

a9e1869608531551a033133e69a97dff68e51af7
SHA256

bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45
SHA512

ec25376b516f4ce0c558c877e0c6a0f1e5efcf6eed1c196d0a8006a57da0e914711eff86b9645c7ceec4d07febe591cbecbdc708e9b3b1263d2215169aee68d9
SSDEEP

49152:IFno/jfcJtTF+TxMoxc1TU+j+dAzGkiT:IFno/jUtIuoITsdZT

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/2108-8-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2108-3-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4976-5-0x0000000004020000-0x0000000004169000-memory.dmp	family_vidar_v7
behavioral2/memory/2108-10-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2108-19-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2108-20-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2108-37-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/2108-38-0x0000000000400000-0x0000000000646000-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
2108	kat44AA.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 4976 set thread context of 2108	4976	bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.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	kat44AA.tmp

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2108	kat44AA.tmp
2108	kat44AA.tmp

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4976 wrote to memory of 2108	4976	bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe	80
PID 4976 wrote to memory of 2108	4976	bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe	80
PID 4976 wrote to memory of 2108	4976	bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe	80
PID 4976 wrote to memory of 2108	4976	bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe	80
PID 4976 wrote to memory of 2108	4976	bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe	80
PID 4976 wrote to memory of 2108	4976	bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe	80
PID 4976 wrote to memory of 2108	4976	bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe	80
PID 4976 wrote to memory of 2108	4976	bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe	80

C:\Users\Admin\AppData\Local\Temp\bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe
"C:\Users\Admin\AppData\Local\Temp\bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4976
- C:\Users\Admin\AppData\Local\Temp\kat44AA.tmp
  C:\Users\Admin\AppData\Local\Temp\kat44AA.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  PID:2108

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\kat44AA.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/2108-8-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2108-3-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2108-10-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2108-19-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2108-20-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2108-23-0x0000000028570000-0x00000000287CF000-memory.dmp

Filesize
2.4MB

Download
memory/2108-37-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2108-38-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/4976-0-0x0000000002350000-0x0000000002351000-memory.dmp

Filesize
4KB

Download
memory/4976-9-0x0000000000400000-0x0000000000602000-memory.dmp

Filesize
2.0MB

Download
memory/4976-5-0x0000000004020000-0x0000000004169000-memory.dmp

Filesize
1.3MB

Download

Analysis

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