marsstealer | 808b5b33fe2f71bdc96d364ece4a61aca8fe93dcebb6c393a3917314558a11d5

Target

Builded.exe
Size

159KB
MD5

875005c576b793f593859824c55fa20e
SHA1

a75f46ffce6564cc83a76ec54606daaddc6e6098
SHA256

808b5b33fe2f71bdc96d364ece4a61aca8fe93dcebb6c393a3917314558a11d5
SHA512

797f9dad651543a9fe38ccaba6dace3dbb01346bc69290d56bb745b4dba2c6deae97027083ed4dee59c3aba4d8865e23ada59f96f45a2b42adedd25c21c3a09a
SSDEEP

3072:UTn6A4hLbGdwSWyAIzJDH3hFEEfIj7TMg5UJSp8Bb8EG:Sn6UxAINdFTIj7TH5I8EG

Score

10^/10

marsstealer default discovery spyware stealer

Malware Config

Extracted

Family

marsstealer

Botnet

Default

54.159.203.55/test.php

Signatures

Mars Stealer
An infostealer written in C++ based on other infostealers.
stealer marsstealer
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1272 cmd.exe
Loads dropped DLL 2 IoCs

Processes:

Builded.exe

pid process

832 Builded.exe
832 Builded.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
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081
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
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1272	cmd.exe

pid	process
832	Builded.exe
832	Builded.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

Processes:

Builded.exe

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

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

1136 timeout.exe

pid	process
1136	timeout.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

Builded.execmd.exe

description	pid	process	target process
PID 832 wrote to memory of 1272	832	Builded.exe	cmd.exe
PID 832 wrote to memory of 1272	832	Builded.exe	cmd.exe
PID 832 wrote to memory of 1272	832	Builded.exe	cmd.exe
PID 832 wrote to memory of 1272	832	Builded.exe	cmd.exe
PID 1272 wrote to memory of 1136	1272	cmd.exe	timeout.exe
PID 1272 wrote to memory of 1136	1272	cmd.exe	timeout.exe
PID 1272 wrote to memory of 1136	1272	cmd.exe	timeout.exe
PID 1272 wrote to memory of 1136	1272	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\Builded.exe
"C:\Users\Admin\AppData\Local\Temp\Builded.exe"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:832

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\Builded.exe" & exit
2⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
PID:1272

C:\Windows\SysWOW64\timeout.exe
timeout /t 5
3⤵
- Delays execution with timeout.exe
PID:1136

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\ProgramData\mozglue.dll

Filesize
133KB

MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
\ProgramData\nss3.dll

Filesize
1.2MB

MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
memory/832-54-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download
memory/832-55-0x0000000075091000-0x0000000075093000-memory.dmp

Filesize
8KB

Download
memory/832-56-0x0000000060900000-0x0000000060992000-memory.dmp

Filesize
584KB

Download
memory/832-78-0x0000000000400000-0x000000000043D000-memory.dmp

Filesize
244KB

Download
memory/1136-79-0x0000000000000000-mapping.dmp

Download
memory/1272-77-0x0000000000000000-mapping.dmp

Download