systembc | 1e5cab880268f538d1fc0c584a010e00f0196c258b8936138489bcfe6fbe0589

Analysis

max time kernel
144s
max time network
124s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
09-01-2025 09:45

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General

Target

JaffaCakes118_c4fd01d2a88af3b53d70a3b52e1a5448.exe
Size

209KB
MD5

c4fd01d2a88af3b53d70a3b52e1a5448
SHA1

dbe77b56aba59e9996be9e6724dddb0dc1cf78c1
SHA256

1e5cab880268f538d1fc0c584a010e00f0196c258b8936138489bcfe6fbe0589
SHA512

16c1e4f1526d9ed47d513d7d1a5812c8cd6edb0f5d494351a08264cd3e62e6285d48f536c167b4933e0df22dad46f9dea0ff97d2f7f339dc1e8a32262ee4c120
SSDEEP

6144:YDnLgI91y1UkT57iJz/DpURWPSvHuUiYphu1Ug:cnLh9yn52rpUR5vHuRYpM+g

Score

10^/10

systembc discovery trojan upx

Malware Config

Extracted

Family

systembc

yan0212.com:4039

yan0212.net:4039

Signatures

SystemBC
SystemBC is a proxy and remote administration tool first seen in 2019.
trojan systembc
Systembc family
systembc

Executes dropped EXE 1 IoCs

pid	Process
3040	mkpffau.exe

Looks up external IP address via web service 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

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

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/2324-1-0x0000000000400000-0x00000000045F0000-memory.dmp	upx
behavioral1/files/0x000a000000016d64-7.dat	upx

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Tasks\mkpffau.job	JaffaCakes118_c4fd01d2a88af3b53d70a3b52e1a5448.exe
File opened for modification	C:\Windows\Tasks\mkpffau.job	JaffaCakes118_c4fd01d2a88af3b53d70a3b52e1a5448.exe

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mkpffau.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_c4fd01d2a88af3b53d70a3b52e1a5448.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2324	JaffaCakes118_c4fd01d2a88af3b53d70a3b52e1a5448.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2648 wrote to memory of 3040	2648	taskeng.exe	32
PID 2648 wrote to memory of 3040	2648	taskeng.exe	32
PID 2648 wrote to memory of 3040	2648	taskeng.exe	32
PID 2648 wrote to memory of 3040	2648	taskeng.exe	32

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_c4fd01d2a88af3b53d70a3b52e1a5448.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_c4fd01d2a88af3b53d70a3b52e1a5448.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
PID:2324

C:\Windows\system32\taskeng.exe
taskeng.exe {73391206-73EE-4D16-9814-33AB1CE79806} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:2648
- C:\ProgramData\nesal\mkpffau.exe
  C:\ProgramData\nesal\mkpffau.exe start
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:3040

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\nesal\mkpffau.exe

Filesize
209KB

MD5
c4fd01d2a88af3b53d70a3b52e1a5448

SHA1
dbe77b56aba59e9996be9e6724dddb0dc1cf78c1

SHA256
1e5cab880268f538d1fc0c584a010e00f0196c258b8936138489bcfe6fbe0589

SHA512
16c1e4f1526d9ed47d513d7d1a5812c8cd6edb0f5d494351a08264cd3e62e6285d48f536c167b4933e0df22dad46f9dea0ff97d2f7f339dc1e8a32262ee4c120

Download Submit
memory/2324-1-0x0000000000400000-0x00000000045F0000-memory.dmp

Filesize
65.9MB

Download
memory/2324-2-0x0000000000400000-0x00000000045F0000-memory.dmp

Filesize
65.9MB

Download
memory/3040-11-0x0000000000400000-0x00000000045F0000-memory.dmp

Filesize
65.9MB

Download