systembc | 902337bbf17ac4e015e03d12e79b60b8dd5a8362496da3291a39e9124c58d9ff

Analysis

max time kernel
147s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
04/06/2024, 15:15

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General

Target
lrthijawd.exe
Size 898KB
Sample240604-sm328sbc4t
SHA256 902337bbf17ac4e015e03d12e79b60b8dd5a8362496da3291a39e9124c58d9ff
MD5 1b1ecd323162c054864b63ada693cd71
SHA1 333a67545a5d1aad4d73a3501f7152b4529b6b3e
SHA512 f1776b6a457108f10ca940ce02ce98b73404f5cf18fccee4977024cfaf74d7f48666d4da9be1bee27531525e276cb8cfadba39b0c81e0fd8cbe42f7672f45b71
SSDEEP 24576:juDXTIGaPhEYzUzA0amuDXTIGaPhEYzUzA0bnl:KDjlabwz9aDjlabwz9rl
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

systembc trojan

Malware Config

Signatures

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

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	lrthijawd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	work.exe

Executes dropped EXE 4 IoCs

pid	Process
1768	work.exe
4984	jergs.exe
1544	ialj.exe
1208	ialj.exe

Drops file in Windows directory 2 IoCs

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

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4984	jergs.exe
4984	jergs.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 4472 wrote to memory of 1208	4472	lrthijawd.exe	91
PID 4472 wrote to memory of 1208	4472	lrthijawd.exe	91
PID 1208 wrote to memory of 1768	1208	cmd.exe	94
PID 1208 wrote to memory of 1768	1208	cmd.exe	94
PID 1768 wrote to memory of 4984	1768	work.exe	95
PID 1768 wrote to memory of 4984	1768	work.exe	95
PID 1768 wrote to memory of 4984	1768	work.exe	95

C:\Users\Admin\AppData\Local\Temp\lrthijawd.exe
"C:\Users\Admin\AppData\Local\Temp\lrthijawd.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4472
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RarSFX0\1.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1208
- - C:\Users\Admin\AppData\Local\Temp\RarSFX0\work.exe
    work.exe -priverdD
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious use of WriteProcessMemory
    PID:1768
  - - C:\Users\Admin\AppData\Local\Temp\RarSFX1\jergs.exe
      "C:\Users\Admin\AppData\Local\Temp\RarSFX1\jergs.exe"
      4⤵
      Executes dropped EXE
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      PID:4984

C:\ProgramData\hdjr\ialj.exe
C:\ProgramData\hdjr\ialj.exe start2
1⤵
- Executes dropped EXE
PID:1544

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=2804 --field-trial-handle=2292,i,2103142837140538807,15881446839139365070,262144 --variations-seed-version /prefetch:8
1⤵
PID:1700

C:\ProgramData\hdjr\ialj.exe
C:\ProgramData\hdjr\ialj.exe start2
1⤵
- Executes dropped EXE
PID:1208

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

1.bat

Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\1.bat
Size 35B
SHA256 065d2b17ad499587dc9de7ee9ecda4938b45da1df388bc72e6627dff220f64d2
MD5 ff59d999beb970447667695ce3273f75
SHA1 316fa09f467ba90ac34a054daf2e92e6e2854ff8
SHA512 d5ac72cb065a3cd3cb118a69a2f356314eeed24dcb4880751e1a3683895e66cedc62607967e29f77a0c27adf1c9fe0efd86e804f693f0a63a5b51b0bf0056b5d
MD5 SHA1 SHA512

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work.exe

Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\work.exe
Size 453KB
SHA256 9dd8267e66dc584eecb3bece47e826d3189e41077f4083acdfc9a4f623b9c187
MD5 405b7fbe8c0ed98620064f0cd80f24c4
SHA1 bb9e45038e8a9f7b7cd0db62858ac65c74b74821
SHA512 3dd4c407f6c2250d20c005e816e80ad442bb07f84ab02e25951331808fb4229219f9fddbcf1ac2e6d70985e3077a6401905f18a8b2c633e9d0a8b9cc6971b61d
SSDEEP 12288:yyveQB/fTHIGaPkKEYzURNAwbAgOT+t1nN:yuDXTIGaPhEYzUzA0bnN
MD5 SHA1 SHA512 SSDEEP

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jergs.exe

Path C:\Users\Admin\AppData\Local\Temp\RarSFX1\jergs.exe
Size 16KB
SHA256 cc5bb638cb34cbd386a906b7708eb62e05e3fc991a20bd060e1d84f722d29ff1
MD5 c661a77c31f83c413a96b5537ad31989
SHA1 8a5a47e39a9efa9dc4de447d2ae4cd5e375e3557
SHA512 b86e45d36d8566b51f932f660ee9c3d79cea1a2eb34a9f7da7b2ccc5e50c74f319e8005e43d719c5722ec148ddddf1351a7f9edc430888e572b3884d1610b1aa
SSDEEP 384:rC+AHNZw/WnlrobdglGbLMoy+yG+yir1dV:r0gklrydgQP1yO67V
MD5 SHA1 SHA512 SSDEEP

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