marsstealer | 17ad92c5d4b0707380de23f0dc97a7d50319d3f332be6a6d9cf30d239d49f744

Resubmissions

06-04-2024 22:23

240406-2a3elscg2w 10

06-04-2024 22:20

240406-19d1macf7v 3

Analysis

max time kernel
120s
max time network
136s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
06-04-2024 22:23

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General

Target

COBRA election-notice.pdf.exe
Size

8.8MB
MD5

979d0840f1018723a0c2f1b38e053a87
SHA1

bc00bc18122b597d5484d05f6f1df694fa9f9f64
SHA256

17ad92c5d4b0707380de23f0dc97a7d50319d3f332be6a6d9cf30d239d49f744
SHA512

2f6c2f764e0a9e057c25e32911721f47872e76b2cb9320342b7c221d088dab95806fc2d4499fa4151a508dc3a6fc35966d55410b6d53851cc1a382ad7c775729
SSDEEP

12288:u7WDZ2e76xWryJabHBAWAzADGBUghdvfKKmWe4b3hZ1I/p1LBaYXK:V8IKLJZZ1I/pu

Score

10^/10

marsstealer default spyware stealer

Malware Config

Extracted

Family

marsstealer

Botnet

Default

Signatures

Mars Stealer
An infostealer written in C++ based on other infostealers.
stealer marsstealer
Executes dropped EXE 1 IoCs

Processes:

F5BQ3N.exe

pid process

2852 F5BQ3N.exe
Loads dropped DLL 5 IoCs

Processes:

COBRA election-notice.pdf.exeWerFault.exe

pid process

1760 COBRA election-notice.pdf.exe
1760 COBRA election-notice.pdf.exe
820 WerFault.exe
820 WerFault.exe
820 WerFault.exe
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
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

820 2852 WerFault.exe F5BQ3N.exe
Modifies registry class 1 IoCs

Processes:

F5BQ3N.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000_CLASSES\Local Settings\MuiCache F5BQ3N.exe

pid	process
2852	F5BQ3N.exe

pid	process
1760	COBRA election-notice.pdf.exe
1760	COBRA election-notice.pdf.exe
820	WerFault.exe
820	WerFault.exe
820	WerFault.exe

pid	pid_target	process	target process
820	2852	WerFault.exe	F5BQ3N.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-778096762-2241304387-192235952-1000_CLASSES\Local Settings\MuiCache	F5BQ3N.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

COBRA election-notice.pdf.exeF5BQ3N.exe

description	pid	process	target process
PID 1760 wrote to memory of 2852	1760	COBRA election-notice.pdf.exe	F5BQ3N.exe
PID 1760 wrote to memory of 2852	1760	COBRA election-notice.pdf.exe	F5BQ3N.exe
PID 1760 wrote to memory of 2852	1760	COBRA election-notice.pdf.exe	F5BQ3N.exe
PID 1760 wrote to memory of 2852	1760	COBRA election-notice.pdf.exe	F5BQ3N.exe
PID 2852 wrote to memory of 820	2852	F5BQ3N.exe	WerFault.exe
PID 2852 wrote to memory of 820	2852	F5BQ3N.exe	WerFault.exe
PID 2852 wrote to memory of 820	2852	F5BQ3N.exe	WerFault.exe
PID 2852 wrote to memory of 820	2852	F5BQ3N.exe	WerFault.exe

C:\Users\Admin\AppData\Local\Temp\COBRA election-notice.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\COBRA election-notice.pdf.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1760
- C:\Users\Admin\AppData\Local\Temp\Low\F5BQ3N.exe
  "C:\Users\Admin\AppData\Local\Temp\Low\F5BQ3N.exe"
  2⤵
  - Executes dropped EXE
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2852
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2852 -s 1400
    3⤵
    - Loads dropped DLL
    - Program crash
    PID:820

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

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\Low\F5BQ3N.exe

Filesize
159KB

MD5
f07befa95b54aa2cd90cfbbfdb9d0942

SHA1
91c44a024b214e656c4279d1223a7beffeef129f

SHA256
d9f52689efae410865d403b2707f5319b99c2985aed876254141fa7a7699e7e3

SHA512
a8b5daf2b7d0b3cec0841953c00e9a58a08373af844ebaf37ada66a260dad9002fb99edb0673388cb9a5544a2908faab09d544cf5099554303cc2da9f4de46b6

Download Submit
memory/1760-1-0x0000000074080000-0x000000007476E000-memory.dmp

Filesize
6.9MB

Download
memory/1760-0-0x00000000011A0000-0x0000000001242000-memory.dmp

Filesize
648KB

Download
memory/1760-2-0x0000000004DB0000-0x0000000004DF0000-memory.dmp

Filesize
256KB

Download
memory/1760-11-0x0000000000B50000-0x0000000000B8D000-memory.dmp

Filesize
244KB

Download
memory/1760-14-0x0000000074080000-0x000000007476E000-memory.dmp

Filesize
6.9MB

Download
memory/2852-13-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download