stealc | 32d0ae27d9ae49a224785cd08bae82b0ec4e944145cb2f106873f70fc2908fe7

Analysis

max time kernel
94s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
16/09/2024, 10:59

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General

Target
file.exe
Size 207KB
Sample240916-m3dvdstekf
SHA256 32d0ae27d9ae49a224785cd08bae82b0ec4e944145cb2f106873f70fc2908fe7
MD5 b1394501c618f78b74c3ca0c2d81a33b
SHA1 73707a6facef7e1750fb6d47f3aa840558b17a30
SHA512 0b3aff6484ee73136fd3bf36afad78f126e520b599def3c76b2e83e150fc919d484fd18d7bce0e006abae554db50ef566a6d13ac349c32fae67ea8e8796ce121
SSDEEP 6144:tt85qw0Gl+L8nCdiexzu4383mV8F8+Fuwx1EO:XuCr8nsiMzu43Amk80V1EO
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc default credential_access discovery spyware stealer

Malware Config

Extracted

Family

stealc

Botnet

default

http://46.8.231.109

Attributes

url_path
/c4754d4f680ead72.php

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003
Downloads MZ/PE file

Checks computer location settings 2 TTPs 3 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-1-5-21-2392887640-1187051047-2909758433-1000\Control Panel\International\Geo\Nation	RegAsm.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Control Panel\International\Geo\Nation	cmd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Control Panel\International\Geo\Nation	cmd.exe

Loads dropped DLL 2 IoCs

pid	Process
3876	RegAsm.exe
3876	RegAsm.exe

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 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
Unsecured Credentials: Credentials In Files 1 TTPs
Steal credentials from unsecured files.
credential_access stealer

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 2960 set thread context of 3876	2960	file.exe	85

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	file.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	RegAsm.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	RegAsm.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3876	RegAsm.exe
3876	RegAsm.exe
3876	RegAsm.exe
3876	RegAsm.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1264	cmd.exe
4416	cmd.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2960 wrote to memory of 1400	2960	file.exe	83
PID 2960 wrote to memory of 1400	2960	file.exe	83
PID 2960 wrote to memory of 1400	2960	file.exe	83
PID 2960 wrote to memory of 1608	2960	file.exe	84
PID 2960 wrote to memory of 1608	2960	file.exe	84
PID 2960 wrote to memory of 1608	2960	file.exe	84
PID 2960 wrote to memory of 3876	2960	file.exe	85
PID 2960 wrote to memory of 3876	2960	file.exe	85
PID 2960 wrote to memory of 3876	2960	file.exe	85
PID 2960 wrote to memory of 3876	2960	file.exe	85
PID 2960 wrote to memory of 3876	2960	file.exe	85
PID 2960 wrote to memory of 3876	2960	file.exe	85
PID 2960 wrote to memory of 3876	2960	file.exe	85
PID 2960 wrote to memory of 3876	2960	file.exe	85
PID 2960 wrote to memory of 3876	2960	file.exe	85
PID 3876 wrote to memory of 4416	3876	RegAsm.exe	91
PID 3876 wrote to memory of 4416	3876	RegAsm.exe	91
PID 3876 wrote to memory of 4416	3876	RegAsm.exe	91
PID 3876 wrote to memory of 1264	3876	RegAsm.exe	93
PID 3876 wrote to memory of 1264	3876	RegAsm.exe	93
PID 3876 wrote to memory of 1264	3876	RegAsm.exe	93

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2960
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:1400
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:1608
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Checks computer location settings
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:3876
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c start "" "C:\ProgramData\BFIJKEBFBF.exe"
    3⤵
    - Checks computer location settings
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    PID:4416
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c start "" "C:\ProgramData\IDBKKKKKFB.exe"
    3⤵
    - Checks computer location settings
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    PID:1264

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

mozglue.dll

Path C:\ProgramData\mozglue.dll
Size 593KB
SHA256 ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
MD5 c8fd9be83bc728cc04beffafc2907fe9
SHA1 95ab9f701e0024cedfbd312bcfe4e726744c4f2e
SHA512 fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040
SSDEEP 12288:BlSyAom/gcRKMdRm4wFkRHuyG4RRGJVDjMk/x21R8gY/r:BKgcRKMdRm4wFkVVDGJVv//x21R8br
MD5 SHA1 SHA512 SSDEEP

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nss3.dll

Path C:\ProgramData\nss3.dll
Size 2.0MB
SHA256 ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5
MD5 1cc453cdf74f31e4d913ff9c10acdde2
SHA1 6e85eae544d6e965f15fa5c39700fa7202f3aafe
SHA512 dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571
SSDEEP 49152:fECf12gikHlnKGxJRIB+y5nvxnaOSJ3HFNWYrVvE4CQsgzMmQfTU1NrWmy4KoAzh:J7Tf8J1Q+SS5/nr
MD5 SHA1 SHA512 SSDEEP

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memory/2960-0-0x0000000074F2E000-0x0000000074F2F000-memory.dmp

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memory/2960-1-0x0000000000580000-0x00000000005B8000-memory.dmp

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memory/2960-2-0x0000000005300000-0x00000000058A4000-memory.dmp

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memory/2960-8-0x0000000074F20000-0x00000000756D0000-memory.dmp

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memory/2960-83-0x0000000074F20000-0x00000000756D0000-memory.dmp

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memory/3876-4-0x0000000000400000-0x0000000000643000-memory.dmp

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memory/3876-7-0x0000000000400000-0x0000000000643000-memory.dmp

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memory/3876-9-0x0000000000400000-0x0000000000643000-memory.dmp

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memory/3876-10-0x0000000061E00000-0x0000000061EF3000-memory.dmp

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memory/3876-82-0x0000000000400000-0x0000000000643000-memory.dmp

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