orcus | 3f25bc78db5f00c85bbd8662838858fa12989976b7be9c70aa6f68fe92c78a53

Analysis

max time kernel
150s
max time network
158s
platform
windows10_x64
resource
win10v20210408
submitted
28-05-2021 17:37

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General

Target

f6d66119_extracted.exe
Size

953KB
MD5

7c0515a40b439d120deb649fb8ccafe3
SHA1

c081cb8c417f69a8675f9c90b5cc6778d770d8a7
SHA256

3f25bc78db5f00c85bbd8662838858fa12989976b7be9c70aa6f68fe92c78a53
SHA512

12f160d3162f5fa8a62e972630e0e9c17385e7ab4a8760a8680f20a89f3acc64c1baff8a68b5a7b8e8f7785b72cac3ae7254bb1b223aacbe413a5e5a65455f41

Score

10^/10

orcus start - steam rat spyware stealer

Malware Config

Extracted

Family

orcus

Botnet

Start - Steam

185.217.1.185:911

Mutex

a36e4add169c442b882f8f0c5cb7e8cf

Attributes

autostart_method
TaskScheduler
enable_keylogger
false
install_path
%programdata%\Steam\Steam Client.exe
reconnect_delay
6600
registry_keyname
Steam Webhelper Standalone
taskscheduler_taskname
Steam Client WebHelper
watchdog_path
Temp\Steam Client WebHelper.exe

Signatures

Orcus
Orcus is a Remote Access Trojan that is being sold on underground forums.
rat spyware stealer orcus

Orcus Main Payload 3 IoCs

resource	yara_rule
behavioral2/files/0x000300000001ab56-124.dat	family_orcus
behavioral2/files/0x000300000001ab56-126.dat	family_orcus
behavioral2/files/0x000300000001ab56-135.dat	family_orcus

Orcurs Rat Executable 3 IoCs

resource	yara_rule
behavioral2/files/0x000300000001ab56-124.dat	orcus
behavioral2/files/0x000300000001ab56-126.dat	orcus
behavioral2/files/0x000300000001ab56-135.dat	orcus

Executes dropped EXE 4 IoCs

pid	Process
4268	Steam Client.exe
3476	Steam Client.exe
492	Steam Client WebHelper.exe
1004	Steam Client WebHelper.exe

Drops desktop.ini file(s) 2 IoCs

description	ioc	Process
File created	C:\Windows\assembly\Desktop.ini	f6d66119_extracted.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	f6d66119_extracted.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\assembly	f6d66119_extracted.exe
File created	C:\Windows\assembly\Desktop.ini	f6d66119_extracted.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	f6d66119_extracted.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1004	Steam Client WebHelper.exe
1004	Steam Client WebHelper.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
4268	Steam Client.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe
1004	Steam Client WebHelper.exe
4268	Steam Client.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4268	Steam Client.exe
Token: SeDebugPrivilege	492	Steam Client WebHelper.exe
Token: SeDebugPrivilege	1004	Steam Client WebHelper.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4652 wrote to memory of 3036	4652	f6d66119_extracted.exe	75
PID 4652 wrote to memory of 3036	4652	f6d66119_extracted.exe	75
PID 3036 wrote to memory of 2204	3036	csc.exe	77
PID 3036 wrote to memory of 2204	3036	csc.exe	77
PID 4652 wrote to memory of 4268	4652	f6d66119_extracted.exe	78
PID 4652 wrote to memory of 4268	4652	f6d66119_extracted.exe	78
PID 4268 wrote to memory of 492	4268	Steam Client.exe	80
PID 4268 wrote to memory of 492	4268	Steam Client.exe	80
PID 4268 wrote to memory of 492	4268	Steam Client.exe	80
PID 492 wrote to memory of 1004	492	Steam Client WebHelper.exe	81
PID 492 wrote to memory of 1004	492	Steam Client WebHelper.exe	81
PID 492 wrote to memory of 1004	492	Steam Client WebHelper.exe	81

C:\Users\Admin\AppData\Local\Temp\f6d66119_extracted.exe
"C:\Users\Admin\AppData\Local\Temp\f6d66119_extracted.exe"
1⤵
- Drops desktop.ini file(s)
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:4652
- C:\Windows\Microsoft.NET\Framework64\v2.0.50727\csc.exe
  "C:\Windows\Microsoft.NET\Framework64\v2.0.50727\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\y-p2yf_o.cmdline"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3036
- - C:\Windows\Microsoft.NET\Framework64\v2.0.50727\cvtres.exe
    C:\Windows\Microsoft.NET\Framework64\v2.0.50727\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESB973.tmp" "c:\Users\Admin\AppData\Local\Temp\CSCB972.tmp"
    3⤵
    PID:2204
- C:\ProgramData\Steam\Steam Client.exe
  "C:\ProgramData\Steam\Steam Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4268
- - C:\Users\Admin\AppData\Local\Temp\Steam Client WebHelper.exe
    "C:\Users\Admin\AppData\Local\Temp\Steam Client WebHelper.exe" /launchSelfAndExit "C:\ProgramData\Steam\Steam Client.exe" 4268 /protectFile
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:492
  - - C:\Users\Admin\AppData\Local\Temp\Steam Client WebHelper.exe
      "C:\Users\Admin\AppData\Local\Temp\Steam Client WebHelper.exe" /watchProcess "C:\ProgramData\Steam\Steam Client.exe" 4268 "/protectFile"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1004

C:\ProgramData\Steam\Steam Client.exe
"C:\ProgramData\Steam\Steam Client.exe"
1⤵
- Executes dropped EXE
PID:3476

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/492-148-0x00000000009D0000-0x00000000009D1000-memory.dmp

Filesize
4KB

Download
memory/3036-122-0x00000000009B0000-0x00000000009B2000-memory.dmp

Filesize
8KB

Download
memory/3476-143-0x000000001BA90000-0x000000001BA92000-memory.dmp

Filesize
8KB

Download
memory/4268-132-0x0000000000F60000-0x0000000000F70000-memory.dmp

Filesize
64KB

Download
memory/4268-136-0x0000000001240000-0x0000000001255000-memory.dmp

Filesize
84KB

Download
memory/4268-141-0x0000000001260000-0x000000000126C000-memory.dmp

Filesize
48KB

Download
memory/4268-142-0x000000001B772000-0x000000001B774000-memory.dmp

Filesize
8KB

Download
memory/4268-133-0x0000000000F50000-0x0000000000F52000-memory.dmp

Filesize
8KB

Download
memory/4268-134-0x0000000002CB0000-0x0000000002CF8000-memory.dmp

Filesize
288KB

Download
memory/4268-131-0x0000000000F20000-0x0000000000F2C000-memory.dmp

Filesize
48KB

Download
memory/4268-130-0x000000001B770000-0x000000001B772000-memory.dmp

Filesize
8KB

Download
memory/4268-129-0x0000000002C50000-0x0000000002CAA000-memory.dmp

Filesize
360KB

Download
memory/4268-150-0x000000001B774000-0x000000001B776000-memory.dmp

Filesize
8KB

Download
memory/4268-127-0x0000000000940000-0x0000000000941000-memory.dmp

Filesize
4KB

Download
memory/4652-114-0x0000000001210000-0x0000000001212000-memory.dmp

Filesize
8KB

Download