systembc | 5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db

General

Target

5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db.exe
Size

128KB
MD5

8b462afe450df7f333a7da76f731cb62
SHA1

73e532ebfbd033039575b5457ac7023f920741fe
SHA256

5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db
SHA512

2c4029871f2efa811b4cf17e1b55e273254716c01302de5f1489ec9ecc1342b58de929fac043f4f3b6720c1170c59e549540e626d46087bc687991b98256c3cd

Score

10^/10

systembc suricata trojan

Malware Config

Extracted

Family

systembc

C2

sdadvert197.com:4044

mexstat128.com:4044

Signatures

SystemBC
SystemBC is a proxy and remote administration tool first seen in 2019.
trojan systembc
suricata: ET MALWARE Observed SystemBC CnC Domain in DNS Query
suricata: ET MALWARE Observed SystemBC CnC Domain in DNS Query
suricata
Executes dropped EXE 1 IoCs

Processes:

otsuek.exe

pid process

856 otsuek.exe
Looks up external IP address via web service 4 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

4 api.ipify.org
5 api.ipify.org
6 ip4.seeip.org
7 ip4.seeip.org
Uses Tor communications 1 TTPs
Malware can proxy its traffic through Tor for more anonymity.

Connection Proxy
T1090

pid	process
856	otsuek.exe

flow	ioc
4	api.ipify.org
5	api.ipify.org
6	ip4.seeip.org
7	ip4.seeip.org

Drops file in Windows directory 2 IoCs

Processes:

5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db.exe

description	ioc	process
File created	C:\Windows\Tasks\otsuek.job	5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db.exe
File opened for modification	C:\Windows\Tasks\otsuek.job	5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db.exe

pid process

1660 5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db.exe

pid	process
1660	5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

taskeng.exe

description	pid	process	target process
PID 1724 wrote to memory of 856	1724	taskeng.exe	otsuek.exe
PID 1724 wrote to memory of 856	1724	taskeng.exe	otsuek.exe
PID 1724 wrote to memory of 856	1724	taskeng.exe	otsuek.exe
PID 1724 wrote to memory of 856	1724	taskeng.exe	otsuek.exe

C:\Users\Admin\AppData\Local\Temp\5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db.exe
"C:\Users\Admin\AppData\Local\Temp\5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
PID:1660

C:\Windows\system32\taskeng.exe
taskeng.exe {A7F3301D-B96D-46A3-A588-B033ADA06137} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:1724

C:\ProgramData\hdswux\otsuek.exe
C:\ProgramData\hdswux\otsuek.exe start
2⤵
- Executes dropped EXE
PID:856

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Connection Proxy

1

T1090

Impact

Replay Monitor

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Downloads

C:\ProgramData\hdswux\otsuek.exe
Filesize
128KB

MD5
8b462afe450df7f333a7da76f731cb62

SHA1
73e532ebfbd033039575b5457ac7023f920741fe

SHA256
5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db

SHA512
2c4029871f2efa811b4cf17e1b55e273254716c01302de5f1489ec9ecc1342b58de929fac043f4f3b6720c1170c59e549540e626d46087bc687991b98256c3cd

Download Submit
C:\ProgramData\hdswux\otsuek.exe
Filesize
128KB

MD5
8b462afe450df7f333a7da76f731cb62

SHA1
73e532ebfbd033039575b5457ac7023f920741fe

SHA256
5e27c0fcfbf3bbabdcac743b1d948f88560cbe30ffb8f45beb062d555fd7c3db

SHA512
2c4029871f2efa811b4cf17e1b55e273254716c01302de5f1489ec9ecc1342b58de929fac043f4f3b6720c1170c59e549540e626d46087bc687991b98256c3cd

Download Submit
memory/856-59-0x0000000000000000-mapping.dmp

Download
memory/856-62-0x00000000030AB000-0x00000000030B1000-memory.dmp

Filesize
24KB

Download
memory/856-63-0x0000000000400000-0x0000000002FAB000-memory.dmp

Filesize
43.7MB

Download
memory/1660-54-0x0000000076421000-0x0000000076423000-memory.dmp

Filesize
8KB

Download
memory/1660-56-0x00000000001B0000-0x00000000001B9000-memory.dmp

Filesize
36KB

Download
memory/1660-55-0x00000000002CB000-0x00000000002D2000-memory.dmp

Filesize
28KB

Download
memory/1660-57-0x0000000000400000-0x0000000002FAB000-memory.dmp

Filesize
43.7MB

Download

Analysis

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