marsstealer | 6a0b98e152b8f618d9c6d82ed37034cc0b87404fcbec9fb8edf6b6847f7f75a0

Analysis

max time kernel
118s
max time network
139s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
27-12-2023 01:23

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General

Target

791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exe
Size

13.4MB
MD5

6e08d023664e3f4e835ec3ec198b883a
SHA1

43f2f3321a51f1ca308af891d2e1dbaaee48b045
SHA256

791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad
SHA512

41d44ed76ecda43eab891a2e07cb43481478c39797e44ed017654a8bca346b90bfcf4f444532d8e9765173c2e9b26d5f524fe42ec9a7830230fedbe21f9e0ec1
SSDEEP

12288:bu5DqC9/n1D0jAV8eCeoIl1TroJMExsi+vakV7tbQ3KtwU:buDXVsUThTFyJm

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:

YUSJMSMPGEMLF.exe

pid process

2416 YUSJMSMPGEMLF.exe

pid	process
2416	YUSJMSMPGEMLF.exe

Loads dropped DLL 5 IoCs

Processes:

791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exeWerFault.exe

pid	process
2500	791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exe
2500	791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exe
2952	WerFault.exe
2952	WerFault.exe
2952	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

2952 2416 WerFault.exe YUSJMSMPGEMLF.exe

pid	pid_target	process	target process
2952	2416	WerFault.exe	YUSJMSMPGEMLF.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exeYUSJMSMPGEMLF.exe

description	pid	process	target process
PID 2500 wrote to memory of 2416	2500	791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exe	YUSJMSMPGEMLF.exe
PID 2500 wrote to memory of 2416	2500	791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exe	YUSJMSMPGEMLF.exe
PID 2500 wrote to memory of 2416	2500	791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exe	YUSJMSMPGEMLF.exe
PID 2500 wrote to memory of 2416	2500	791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exe	YUSJMSMPGEMLF.exe
PID 2416 wrote to memory of 2952	2416	YUSJMSMPGEMLF.exe	WerFault.exe
PID 2416 wrote to memory of 2952	2416	YUSJMSMPGEMLF.exe	WerFault.exe
PID 2416 wrote to memory of 2952	2416	YUSJMSMPGEMLF.exe	WerFault.exe
PID 2416 wrote to memory of 2952	2416	YUSJMSMPGEMLF.exe	WerFault.exe

C:\Users\Admin\AppData\Local\Temp\791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exe
"C:\Users\Admin\AppData\Local\Temp\791cb146ce71d27b52dd233a80f5ac4e63f69d49af07a53850954da93ff439ad.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2500

C:\ProgramData\Start Menu\YUSJMSMPGEMLF.exe
"C:\ProgramData\Start Menu\YUSJMSMPGEMLF.exe"
2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:2416

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2416 -s 816
3⤵
- Loads dropped DLL
- Program crash
PID:2952

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

\ProgramData\Microsoft\Windows\Start Menu\YUSJMSMPGEMLF.exe
Filesize
92KB

MD5
70e3573f8dfa1850335423a21c5648de

SHA1
b2d08897553dcc4dafaed402d048cdce785b14b7

SHA256
024fb985e743c8a363a39357a35685251916b80b837bdc903a2adc150d488676

SHA512
2b77716b7e77ab5c84977488d276e8553001336f65c7f6e1fd9ef6329f64b93bc130d773cc9652849454d13d26529b73ed10b0887a7005c2cd964b71d992dcc9

Download Submit
\ProgramData\Microsoft\Windows\Start Menu\YUSJMSMPGEMLF.exe
Filesize
159KB

MD5
a103174262d8c3fd501ffb95323c60b1

SHA1
e40f0dd566ba3d50886d3f9e82bf2c108370d62b

SHA256
bc65e75fcfee4ff9655005f8496f7c86feb892f0caec33c2208e8381cb967248

SHA512
a023dd3997474d427d963a23ccbe7091fdda53d8fde1e1c43eb2e67090a27bd1b0f9eee08757993125cfe10683c38ab0db2194a5847ff51e39d636357c381da2

Download Submit
memory/2416-13-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download
memory/2500-0-0x00000000747B0000-0x0000000074E9E000-memory.dmp

Filesize
6.9MB

Download
memory/2500-1-0x00000000011E0000-0x0000000001262000-memory.dmp

Filesize
520KB

Download
memory/2500-2-0x0000000004E10000-0x0000000004E50000-memory.dmp

Filesize
256KB

Download
memory/2500-6-0x0000000000A50000-0x0000000000A8D000-memory.dmp

Filesize
244KB

Download
memory/2500-12-0x0000000000A50000-0x0000000000A8D000-memory.dmp

Filesize
244KB

Download
memory/2500-14-0x00000000747B0000-0x0000000074E9E000-memory.dmp

Filesize
6.9MB

Download