systembc | fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20

Target

fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe
Size

121KB
MD5

2140899e877c2bb95f71f77c31e205ce
SHA1

b7322db66f0c4b5a48c10ca3213b899131045d11
SHA256

fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20
SHA512

6856af4f8cb1fceede24360c7e081e6beea701a44b80e6276db719e5cba3b6cf5f7fae8df4ce56852ea34e73dfa4e091a8ac258d1efb596e0d7224b33402fe07

Score

10^/10

Malware Config

Family

systembc

sdadvert197.com:4044

mexstat128.com:4044

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:

wklm.exe

pid process

1796 wklm.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

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

Connection Proxy
T1090

pid	process
1796	wklm.exe

Drops file in Windows directory 2 IoCs

Processes:

fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe

description	ioc	process
File created	C:\Windows\Tasks\wklm.job	fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe
File opened for modification	C:\Windows\Tasks\wklm.job	fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe

pid process

1660 fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe

pid	process
1660	fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

taskeng.exe

description	pid	process	target process
PID 1528 wrote to memory of 1796	1528	taskeng.exe	wklm.exe
PID 1528 wrote to memory of 1796	1528	taskeng.exe	wklm.exe
PID 1528 wrote to memory of 1796	1528	taskeng.exe	wklm.exe
PID 1528 wrote to memory of 1796	1528	taskeng.exe	wklm.exe

C:\Windows\system32\taskeng.exe
taskeng.exe {58041107-F218-4969-9751-9F4ADD88957A} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:1528

C:\ProgramData\luifqi\wklm.exe
C:\ProgramData\luifqi\wklm.exe start
2⤵
- Executes dropped EXE
PID:1796

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Connection Proxy

Impact

C:\ProgramData\luifqi\wklm.exe
Filesize
121KB

MD5
2140899e877c2bb95f71f77c31e205ce

SHA1
b7322db66f0c4b5a48c10ca3213b899131045d11

SHA256
fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20

SHA512
6856af4f8cb1fceede24360c7e081e6beea701a44b80e6276db719e5cba3b6cf5f7fae8df4ce56852ea34e73dfa4e091a8ac258d1efb596e0d7224b33402fe07

Download Submit
C:\ProgramData\luifqi\wklm.exe
Filesize
121KB

MD5
2140899e877c2bb95f71f77c31e205ce

SHA1
b7322db66f0c4b5a48c10ca3213b899131045d11

SHA256
fdc98ea3381d04350e38b592c2c63090d6f0bd32388a21fcfc5b7bfcb9753d20

SHA512
6856af4f8cb1fceede24360c7e081e6beea701a44b80e6276db719e5cba3b6cf5f7fae8df4ce56852ea34e73dfa4e091a8ac258d1efb596e0d7224b33402fe07

Download Submit
memory/1660-54-0x000000000336B000-0x0000000003372000-memory.dmp

Filesize
28KB

Download
memory/1660-55-0x0000000000230000-0x0000000000239000-memory.dmp

Filesize
36KB

Download
memory/1660-56-0x0000000075F21000-0x0000000075F23000-memory.dmp

Filesize
8KB

Download
memory/1660-57-0x0000000000400000-0x00000000031D1000-memory.dmp

Filesize
45.8MB

Download
memory/1796-59-0x0000000000000000-mapping.dmp

Download
memory/1796-63-0x00000000002F0000-0x00000000002F9000-memory.dmp

Filesize
36KB

Download
memory/1796-62-0x00000000033BB000-0x00000000033C2000-memory.dmp

Filesize
28KB

Download
memory/1796-64-0x0000000000400000-0x00000000031D1000-memory.dmp

Filesize
45.8MB

Download