systembc | a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da

General

Target

a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da.exe
Size

285KB
MD5

d1cd66d2dca341712b4c6e15649d4a8e
SHA1

8cde8dd0bd6271a55fb4de53713255d294ca1b80
SHA256

a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da
SHA512

39c7be90423d291ea73ee08704024a741cd68e395f46de33d16d2e538a99f4ca58c35f998376814203606e634121fd973311a9621b77e0ab66afb144db32d1e9

Score

10^/10

systembc suricata trojan

Malware Config

Extracted

Family

systembc

C2

advertrex20.xyz:4044

gentexman37.xyz: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:

lfcxud.exe

pid process

640 lfcxud.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
640	lfcxud.exe

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

Drops file in Windows directory 2 IoCs

Processes:

a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da.exe

description	ioc	process
File created	C:\Windows\Tasks\lfcxud.job	a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da.exe
File opened for modification	C:\Windows\Tasks\lfcxud.job	a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da.exe

pid process

1568 a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da.exe

pid	process
1568	a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

taskeng.exe

description	pid	process	target process
PID 1468 wrote to memory of 640	1468	taskeng.exe	lfcxud.exe
PID 1468 wrote to memory of 640	1468	taskeng.exe	lfcxud.exe
PID 1468 wrote to memory of 640	1468	taskeng.exe	lfcxud.exe
PID 1468 wrote to memory of 640	1468	taskeng.exe	lfcxud.exe

C:\Users\Admin\AppData\Local\Temp\a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da.exe
"C:\Users\Admin\AppData\Local\Temp\a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
PID:1568

C:\Windows\system32\taskeng.exe
taskeng.exe {1B1F9846-D614-4351-8309-B1BFD82B0DC5} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:1468
- C:\ProgramData\jsoe\lfcxud.exe
  C:\ProgramData\jsoe\lfcxud.exe start
  2⤵
  - Executes dropped EXE
  PID:640

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Connection Proxy

1

T1090

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Connection Proxy

1

T1090

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\jsoe\lfcxud.exe

MD5
d1cd66d2dca341712b4c6e15649d4a8e

SHA1
8cde8dd0bd6271a55fb4de53713255d294ca1b80

SHA256
a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da

SHA512
39c7be90423d291ea73ee08704024a741cd68e395f46de33d16d2e538a99f4ca58c35f998376814203606e634121fd973311a9621b77e0ab66afb144db32d1e9

Download Submit
C:\ProgramData\jsoe\lfcxud.exe

MD5
d1cd66d2dca341712b4c6e15649d4a8e

SHA1
8cde8dd0bd6271a55fb4de53713255d294ca1b80

SHA256
a33bce78c3d2f661f520dfd920567413fdc6c9a213c3d0f6a574f0d9ffa6e6da

SHA512
39c7be90423d291ea73ee08704024a741cd68e395f46de33d16d2e538a99f4ca58c35f998376814203606e634121fd973311a9621b77e0ab66afb144db32d1e9

Download Submit
memory/640-59-0x0000000000000000-mapping.dmp

Download
memory/640-62-0x0000000000400000-0x00000000046C8000-memory.dmp

Filesize
66.8MB

Download
memory/1568-54-0x0000000076851000-0x0000000076853000-memory.dmp

Filesize
8KB

Download
memory/1568-55-0x0000000000220000-0x0000000000226000-memory.dmp

Filesize
24KB

Download
memory/1568-56-0x0000000000230000-0x0000000000239000-memory.dmp

Filesize
36KB

Download
memory/1568-57-0x0000000000400000-0x00000000046C8000-memory.dmp

Filesize
66.8MB

Download

Analysis

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