marsstealer | a238bd522702802eb2a2b71b4b00a1a1553b1c2fff0d8b9e50b13e999cabbdf3

Analysis

max time kernel
117s
max time network
119s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
26-12-2023 00:03

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General

Target

YoudaoDict.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

Signatures

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

Processes:

BJC701T.exe

pid process

1064 BJC701T.exe
Loads dropped DLL 5 IoCs

Processes:

YoudaoDict.exeWerFault.exe

pid process

3024 YoudaoDict.exe
3024 YoudaoDict.exe
2676 WerFault.exe
2676 WerFault.exe
2676 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

2676 1064 WerFault.exe BJC701T.exe

pid	process
1064	BJC701T.exe

pid	process
3024	YoudaoDict.exe
3024	YoudaoDict.exe
2676	WerFault.exe
2676	WerFault.exe
2676	WerFault.exe

pid	pid_target	process	target process
2676	1064	WerFault.exe	BJC701T.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

YoudaoDict.exeBJC701T.exe

description	pid	process	target process
PID 3024 wrote to memory of 1064	3024	YoudaoDict.exe	BJC701T.exe
PID 3024 wrote to memory of 1064	3024	YoudaoDict.exe	BJC701T.exe
PID 3024 wrote to memory of 1064	3024	YoudaoDict.exe	BJC701T.exe
PID 3024 wrote to memory of 1064	3024	YoudaoDict.exe	BJC701T.exe
PID 1064 wrote to memory of 2676	1064	BJC701T.exe	WerFault.exe
PID 1064 wrote to memory of 2676	1064	BJC701T.exe	WerFault.exe
PID 1064 wrote to memory of 2676	1064	BJC701T.exe	WerFault.exe
PID 1064 wrote to memory of 2676	1064	BJC701T.exe	WerFault.exe

C:\Users\Admin\AppData\Local\Temp\YoudaoDict.exe
"C:\Users\Admin\AppData\Local\Temp\YoudaoDict.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:3024

C:\ProgramData\BJC701T.exe
"C:\ProgramData\BJC701T.exe"
2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1064

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 636
3⤵
- Loads dropped DLL
- Program crash
PID:2676

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

C:\ProgramData\BJC701T.exe
Filesize
92KB

MD5
00c60868dfc94cdc0b2d2453a4a42b02

SHA1
57ef196e7def8eeda550f65cb2c9cca617faf4c3

SHA256
7c488a794e11a1ca69181ce171d77d19e1f097d2f043ffa4b36b1671435a21ab

SHA512
274903117bde982b0ab36474049f41855c4cfa3319b44a790b27fbbc1663349819f4f6385f5656e2d96023661228056553c8da85755ab19a45ec009d70633463

Download Submit
C:\ProgramData\BJC701T.exe
Filesize
159KB

MD5
355142538822114c3357d73d35769ff2

SHA1
85d6d7b919f60c39cc8a3d65bf574877c3a7590f

SHA256
4dc9b6823e021a19ff259c5f0fcc2a023b0dea26adde9e08f1278ba103fdd3cc

SHA512
9099f85fe484df4678e106373630427b8578d73bcea1bf7ba81eb9be4578d607acc50fa1ba97bd063edc1ed9bb27328552aabf2ca3dc0837841f348ceb7689e4

Download Submit
\ProgramData\BJC701T.exe
Filesize
121KB

MD5
d661046b0fdd2675035371ab7ffaf4c7

SHA1
f4eda3887644c550cb3f59c1f615bbefd70f473e

SHA256
0b749b60140f486eeea9b880d5003c3b45369054963cb46cadf206ccdd2640e5

SHA512
a864b08fc3c74527fbcd1792641b6ff03833fe261a69d808d27c9203d80b7b87b9dc300c841aeeeb91c97066d361c186053ea05140cdd7c82cbca2992556eab8

Download Submit
\ProgramData\BJC701T.exe
Filesize
93KB

MD5
352655d7a88f03171b610ae9ef550b00

SHA1
4e3852a3bf8d06aa8ec6b9012c6325ce093cf1a6

SHA256
39afe57637200aa0a276de538c5be74c4d768fbe4850d69021afd3cc12c86f10

SHA512
c154c9aff74940310b7ecea036b67fa8cdf1ea48c0b20a89f6e06cbe9134ee65ab4b82d136c3f81c2ccd9cc4b30f757596d781122b7b94021a47e4d755c0f567

Download Submit
memory/1064-14-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download
memory/3024-0-0x00000000011A0000-0x0000000001228000-memory.dmp

Filesize
544KB

Download
memory/3024-1-0x0000000074A50000-0x000000007513E000-memory.dmp

Filesize
6.9MB

Download
memory/3024-12-0x0000000000790000-0x00000000007CD000-memory.dmp

Filesize
244KB

Download
memory/3024-13-0x0000000074A50000-0x000000007513E000-memory.dmp

Filesize
6.9MB

Download
memory/3024-11-0x0000000000790000-0x00000000007CD000-memory.dmp

Filesize
244KB

Download