marsstealer | a238bd522702802eb2a2b71b4b00a1a1553b1c2fff0d8b9e50b13e999cabbdf3

Analysis

max time kernel
142s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
03-01-2024 15:21

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General

Target

YoudaoDictexe.exe
Size

6.8MB
MD5

ff3d9c5dcde804a90e862de9c1d32a8c
SHA1

04b0da40346d661a11e9e899daec104ee77c6606
SHA256

a238bd522702802eb2a2b71b4b00a1a1553b1c2fff0d8b9e50b13e999cabbdf3
SHA512

288e716dd70bedd1cebdc7582f44d969050de9ffe387ae0b9363937fc41b62eedb1faba1fd0cead9a05ba96a880df4d00727e60cde2606a16849e8a5cf266ac3
SSDEEP

12288:IPvAXg30gk3yrkb+/nCSnilwUOSFaoAiTI2MHPwrQKUs6:IgpbOROQ3s6

Score

10^/10

marsstealer default spyware stealer

Malware Config

Extracted

Family

marsstealer

Botnet

Default

www.moscow-post.ru/ryuka/grocktack/fdzeiw.php

Signatures

Mars Stealer
An infostealer written in C++ based on other infostealers.
stealer marsstealer

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

YoudaoDictexe.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3336304223-2978740688-3645194410-1000\Control Panel\International\Geo\Nation	YoudaoDictexe.exe

Executes dropped EXE 1 IoCs

Processes:

.exe

pid process

4680 .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

5032 4680 WerFault.exe .exe

pid	process
4680	.exe

pid	pid_target	process	target process
5032	4680	WerFault.exe	.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

YoudaoDictexe.exe

description	pid	process	target process
PID 2168 wrote to memory of 4680	2168	YoudaoDictexe.exe	.exe
PID 2168 wrote to memory of 4680	2168	YoudaoDictexe.exe	.exe
PID 2168 wrote to memory of 4680	2168	YoudaoDictexe.exe	.exe

C:\Users\Admin\AppData\Local\Temp\YoudaoDictexe.exe
"C:\Users\Admin\AppData\Local\Temp\YoudaoDictexe.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2168

C:\ProgramData\.exe
"C:\ProgramData\.exe"
2⤵
- Executes dropped EXE
PID:4680

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4680 -s 1376
3⤵
- Program crash
PID:5032

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4680 -ip 4680
1⤵
PID:4472

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

Query Registry

T1012

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

C:\ProgramData\.exe
Filesize
159KB

MD5
355142538822114c3357d73d35769ff2

SHA1
85d6d7b919f60c39cc8a3d65bf574877c3a7590f

SHA256
4dc9b6823e021a19ff259c5f0fcc2a023b0dea26adde9e08f1278ba103fdd3cc

SHA512
9099f85fe484df4678e106373630427b8578d73bcea1bf7ba81eb9be4578d607acc50fa1ba97bd063edc1ed9bb27328552aabf2ca3dc0837841f348ceb7689e4

Download Submit
memory/2168-1-0x0000000074550000-0x0000000074D00000-memory.dmp

Filesize
7.7MB

Download
memory/2168-0-0x0000000000D60000-0x0000000000DE8000-memory.dmp

Filesize
544KB

Download
memory/2168-12-0x0000000074550000-0x0000000074D00000-memory.dmp

Filesize
7.7MB

Download
memory/4680-10-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download
memory/4680-14-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download