systembc | 374dfac7378794f1b4a2b8595944fdff10d5a6cb14b0053c756ad4ca43184518

Analysis

max time kernel
141s
max time network
141s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
14-09-2024 08:06

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General

Target

dfcabb4fe83a48168317bb52644582af_JaffaCakes118.exe
Size

209KB
MD5

dfcabb4fe83a48168317bb52644582af
SHA1

b75212a72147b16ab2a4c6057bdb4c034bc0533d
SHA256

374dfac7378794f1b4a2b8595944fdff10d5a6cb14b0053c756ad4ca43184518
SHA512

936e08e7068f75239713523f8300c5ad1fe231a8ea234404169aa91a37cc4aaf04f85bf65a34a86120bd73e6021868b1cd8ec46e5a101a9d149950fa6d0872e4
SSDEEP

6144:YDnLgI91y1UkT57iJz/DpURWPSvHuUiYphu1U4:cnLh9yn52rpUR5vHuRYpM+4

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

Executes dropped EXE 1 IoCs

pid	Process
2920	gfcwu.exe

UPX packed file 2 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2096-1-0x0000000000400000-0x00000000045F0000-memory.dmp	upx
behavioral1/files/0x0008000000016c62-9.dat	upx

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

Uses Tor communications 1 TTPs
Malware can proxy its traffic through Tor for more anonymity.

Proxy
T1090

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Tasks\gfcwu.job	dfcabb4fe83a48168317bb52644582af_JaffaCakes118.exe
File created	C:\Windows\Tasks\gfcwu.job	dfcabb4fe83a48168317bb52644582af_JaffaCakes118.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	dfcabb4fe83a48168317bb52644582af_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	gfcwu.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2096	dfcabb4fe83a48168317bb52644582af_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2528 wrote to memory of 2920	2528	taskeng.exe	31
PID 2528 wrote to memory of 2920	2528	taskeng.exe	31
PID 2528 wrote to memory of 2920	2528	taskeng.exe	31
PID 2528 wrote to memory of 2920	2528	taskeng.exe	31

C:\Users\Admin\AppData\Local\Temp\dfcabb4fe83a48168317bb52644582af_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\dfcabb4fe83a48168317bb52644582af_JaffaCakes118.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
PID:2096

C:\Windows\system32\taskeng.exe
taskeng.exe {DE65164B-6452-4DF4-8576-A93181BBCED8} S-1-5-18:NT AUTHORITY\System:Service:
1⤵
- Suspicious use of WriteProcessMemory
PID:2528
- C:\ProgramData\kmkbnb\gfcwu.exe
  C:\ProgramData\kmkbnb\gfcwu.exe start
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:2920

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

Proxy

T1090

Exfiltration

Impact

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Downloads

C:\ProgramData\kmkbnb\gfcwu.exe

Filesize
209KB

MD5
dfcabb4fe83a48168317bb52644582af

SHA1
b75212a72147b16ab2a4c6057bdb4c034bc0533d

SHA256
374dfac7378794f1b4a2b8595944fdff10d5a6cb14b0053c756ad4ca43184518

SHA512
936e08e7068f75239713523f8300c5ad1fe231a8ea234404169aa91a37cc4aaf04f85bf65a34a86120bd73e6021868b1cd8ec46e5a101a9d149950fa6d0872e4

Download Submit
memory/2096-1-0x0000000000400000-0x00000000045F0000-memory.dmp

Filesize
65.9MB

Download
memory/2096-3-0x0000000000400000-0x000000000040B000-memory.dmp

Filesize
44KB

Download
memory/2096-2-0x0000000000020000-0x0000000000029000-memory.dmp

Filesize
36KB

Download
memory/2096-4-0x0000000000400000-0x00000000045F0000-memory.dmp

Filesize
65.9MB

Download
memory/2920-13-0x0000000000400000-0x00000000045F0000-memory.dmp

Filesize
65.9MB

Download