orcus | 3f25bc78db5f00c85bbd8662838858fa12989976b7be9c70aa6f68fe92c78a53

Analysis

max time kernel
154s
max time network
153s
platform
windows7_x64
resource
win7v20210410
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

Processes:

resource	yara_rule
C:\ProgramData\Steam\Steam Client.exe	family_orcus
C:\ProgramData\Steam\Steam Client.exe	family_orcus
C:\ProgramData\Steam\Steam Client.exe	family_orcus

Orcurs Rat Executable 3 IoCs

Processes:

resource	yara_rule
C:\ProgramData\Steam\Steam Client.exe	orcus
C:\ProgramData\Steam\Steam Client.exe	orcus
C:\ProgramData\Steam\Steam Client.exe	orcus

Executes dropped EXE 4 IoCs

Processes:

Steam Client.exeSteam Client WebHelper.exeSteam Client WebHelper.exeSteam Client.exe

pid process

1740 Steam Client.exe
1636 Steam Client WebHelper.exe
292 Steam Client WebHelper.exe
1688 Steam Client.exe
Loads dropped DLL 1 IoCs

Processes:

Steam Client WebHelper.exe

pid process

1636 Steam Client WebHelper.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1636	Steam Client WebHelper.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

Steam Client.exeSteam Client WebHelper.exe

pid	process
1740	Steam Client.exe
1740	Steam Client.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
292	Steam Client WebHelper.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe
1740	Steam Client.exe
292	Steam Client WebHelper.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Steam Client.exeSteam Client WebHelper.exeSteam Client WebHelper.exe

description	pid	process
Token: SeDebugPrivilege	1740	Steam Client.exe
Token: SeDebugPrivilege	1636	Steam Client WebHelper.exe
Token: SeDebugPrivilege	292	Steam Client WebHelper.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

f6d66119_extracted.execsc.exeSteam Client.exeSteam Client WebHelper.exetaskeng.exe

description	pid	process	target process
PID 1084 wrote to memory of 2004	1084	f6d66119_extracted.exe	csc.exe
PID 1084 wrote to memory of 2004	1084	f6d66119_extracted.exe	csc.exe
PID 1084 wrote to memory of 2004	1084	f6d66119_extracted.exe	csc.exe
PID 2004 wrote to memory of 1504	2004	csc.exe	cvtres.exe
PID 2004 wrote to memory of 1504	2004	csc.exe	cvtres.exe
PID 2004 wrote to memory of 1504	2004	csc.exe	cvtres.exe
PID 1084 wrote to memory of 1740	1084	f6d66119_extracted.exe	Steam Client.exe
PID 1084 wrote to memory of 1740	1084	f6d66119_extracted.exe	Steam Client.exe
PID 1084 wrote to memory of 1740	1084	f6d66119_extracted.exe	Steam Client.exe
PID 1740 wrote to memory of 1636	1740	Steam Client.exe	Steam Client WebHelper.exe
PID 1740 wrote to memory of 1636	1740	Steam Client.exe	Steam Client WebHelper.exe
PID 1740 wrote to memory of 1636	1740	Steam Client.exe	Steam Client WebHelper.exe
PID 1740 wrote to memory of 1636	1740	Steam Client.exe	Steam Client WebHelper.exe
PID 1636 wrote to memory of 292	1636	Steam Client WebHelper.exe	Steam Client WebHelper.exe
PID 1636 wrote to memory of 292	1636	Steam Client WebHelper.exe	Steam Client WebHelper.exe
PID 1636 wrote to memory of 292	1636	Steam Client WebHelper.exe	Steam Client WebHelper.exe
PID 1636 wrote to memory of 292	1636	Steam Client WebHelper.exe	Steam Client WebHelper.exe
PID 824 wrote to memory of 1688	824	taskeng.exe	Steam Client.exe
PID 824 wrote to memory of 1688	824	taskeng.exe	Steam Client.exe
PID 824 wrote to memory of 1688	824	taskeng.exe	Steam Client.exe

C:\Users\Admin\AppData\Local\Temp\f6d66119_extracted.exe
"C:\Users\Admin\AppData\Local\Temp\f6d66119_extracted.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1084

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\gmbsqyad.cmdline"
2⤵
- Suspicious use of WriteProcessMemory
PID:2004

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\RES255D.tmp" "c:\Users\Admin\AppData\Local\Temp\CSC254C.tmp"
3⤵
PID:1504

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:1740

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" 1740 /protectFile
3⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1636

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" 1740 "/protectFile"
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:292

C:\Windows\system32\taskeng.exe
taskeng.exe {4685A286-307D-44BF-AAD4-511F3C07186C} S-1-5-21-2513283230-931923277-594887482-1000:MRBKYMNO\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:824

C:\ProgramData\Steam\Steam Client.exe
"C:\ProgramData\Steam\Steam Client.exe"
2⤵
- Executes dropped EXE
PID:1688

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\ProgramData\Steam\Steam Client.exe
MD5
7c0515a40b439d120deb649fb8ccafe3

SHA1
c081cb8c417f69a8675f9c90b5cc6778d770d8a7

SHA256
3f25bc78db5f00c85bbd8662838858fa12989976b7be9c70aa6f68fe92c78a53

SHA512
12f160d3162f5fa8a62e972630e0e9c17385e7ab4a8760a8680f20a89f3acc64c1baff8a68b5a7b8e8f7785b72cac3ae7254bb1b223aacbe413a5e5a65455f41

Download Submit
C:\ProgramData\Steam\Steam Client.exe
MD5
7c0515a40b439d120deb649fb8ccafe3

SHA1
c081cb8c417f69a8675f9c90b5cc6778d770d8a7

SHA256
3f25bc78db5f00c85bbd8662838858fa12989976b7be9c70aa6f68fe92c78a53

SHA512
12f160d3162f5fa8a62e972630e0e9c17385e7ab4a8760a8680f20a89f3acc64c1baff8a68b5a7b8e8f7785b72cac3ae7254bb1b223aacbe413a5e5a65455f41

Download Submit
C:\ProgramData\Steam\Steam Client.exe
MD5
7c0515a40b439d120deb649fb8ccafe3

SHA1
c081cb8c417f69a8675f9c90b5cc6778d770d8a7

SHA256
3f25bc78db5f00c85bbd8662838858fa12989976b7be9c70aa6f68fe92c78a53

SHA512
12f160d3162f5fa8a62e972630e0e9c17385e7ab4a8760a8680f20a89f3acc64c1baff8a68b5a7b8e8f7785b72cac3ae7254bb1b223aacbe413a5e5a65455f41

Download Submit
C:\ProgramData\Steam\Steam Client.exe.config
MD5
a2b76cea3a59fa9af5ea21ff68139c98

SHA1
35d76475e6a54c168f536e30206578babff58274

SHA256
f99ef5bf79a7c43701877f0bb0b890591885bb0a3d605762647cc8ffbf10c839

SHA512
b52608b45153c489419228864ecbcb92be24c644d470818dfe15f8c7e661a7bcd034ea13ef401f2b84ad5c29a41c9b4c7d161cc33ae3ef71659bc2bca1a8c4ad

Download Submit
C:\Users\Admin\AppData\Local\Temp\RES255D.tmp
MD5
2b07a31c6e02f3f7234453777183035a

SHA1
f1c0f55869dfd76b4dc0dafaacb572c583f23726

SHA256
6978f43bc34c1860326d1e410de9d5241fe5a7445c846afbff7991f8973ca44c

SHA512
6d5139469bc4444f8d8545d299755eefef00b2c8305c7eb84736acd2bc781949196980c124ceab4018b99a7717e0266a375612564951b61fb77377385287d97c

Download Submit
C:\Users\Admin\AppData\Local\Temp\Steam Client WebHelper.exe
MD5
913967b216326e36a08010fb70f9dba3

SHA1
7b6f8c2eb5b443e03c212b85c2f0edb9c76ad2bf

SHA256
8d880758549220154d2ff4ee578f2b49527c5fb76a07d55237b61e30bcc09e3a

SHA512
c6fcb98d9fd509e9834fc3fba143bd36d41869cc104fbce5354951f0a6756156e34a30796baaa130dd45de3ed96e039ec14716716f6da4569915c7ef2d2b6c33

Download Submit
C:\Users\Admin\AppData\Local\Temp\Steam Client WebHelper.exe
MD5
913967b216326e36a08010fb70f9dba3

SHA1
7b6f8c2eb5b443e03c212b85c2f0edb9c76ad2bf

SHA256
8d880758549220154d2ff4ee578f2b49527c5fb76a07d55237b61e30bcc09e3a

SHA512
c6fcb98d9fd509e9834fc3fba143bd36d41869cc104fbce5354951f0a6756156e34a30796baaa130dd45de3ed96e039ec14716716f6da4569915c7ef2d2b6c33

Download Submit
C:\Users\Admin\AppData\Local\Temp\Steam Client WebHelper.exe
MD5
913967b216326e36a08010fb70f9dba3

SHA1
7b6f8c2eb5b443e03c212b85c2f0edb9c76ad2bf

SHA256
8d880758549220154d2ff4ee578f2b49527c5fb76a07d55237b61e30bcc09e3a

SHA512
c6fcb98d9fd509e9834fc3fba143bd36d41869cc104fbce5354951f0a6756156e34a30796baaa130dd45de3ed96e039ec14716716f6da4569915c7ef2d2b6c33

Download Submit
C:\Users\Admin\AppData\Local\Temp\Steam Client WebHelper.exe.config
MD5
a2b76cea3a59fa9af5ea21ff68139c98

SHA1
35d76475e6a54c168f536e30206578babff58274

SHA256
f99ef5bf79a7c43701877f0bb0b890591885bb0a3d605762647cc8ffbf10c839

SHA512
b52608b45153c489419228864ecbcb92be24c644d470818dfe15f8c7e661a7bcd034ea13ef401f2b84ad5c29a41c9b4c7d161cc33ae3ef71659bc2bca1a8c4ad

Download Submit
C:\Users\Admin\AppData\Local\Temp\gmbsqyad.dll
MD5
589abd50203eb73ded7ff106d8db1f70

SHA1
8128c27c0ef9b106a07ccef2e8c73003e4143404

SHA256
f9c9ed47056f72f38020cf7dd053ea084be430ae74e058e074779e630c20aed2

SHA512
550a96b09502a124b92ac662800994e863e983f64f9b2e6475158c02638a68bb462d3eb4571f30e0d7047a4c9ad980bdd6585c60604340cae8fd3bf40fc369cd

Download Submit
\??\c:\Users\Admin\AppData\Local\Temp\CSC254C.tmp
MD5
63e4ead199cb427e440a8d2f8fde3464

SHA1
9694addf6388844f35f949727fdc01c94c13b8df

SHA256
f37bf0498276e883bfc0f0b375c322f31b957a988f870475fdccd5f3d0b71776

SHA512
1507d425a0b380e6bc3c57828a3afa817fc3991fc34dc61ba6b8e156942ee7ac9cab494065ba734305c01091945048329840827a0af9f0e6a328d4821b04ad29

Download Submit
\??\c:\Users\Admin\AppData\Local\Temp\gmbsqyad.0.cs
MD5
c555d9796194c1d9a1310a05a2264e08

SHA1
82641fc4938680519c3b2e925e05e1001cbd71d7

SHA256
ccbb8fd27ab2f27fbbd871793886ff52ff1fbd9117c98b8d190c1a96b67e498a

SHA512
0b85ca22878998c7697c589739905b218f9b264a32c8f99a9f9dd73d0687a5de46cc7e851697ee16424baf94d301e411648aa2d061ac149a6d2e06b085e07090

Download Submit
\??\c:\Users\Admin\AppData\Local\Temp\gmbsqyad.cmdline
MD5
3861d75ef1ee119bc93c879d25cf1a63

SHA1
b015963dfe2233c3fa271a4621f4a5fdb36e6090

SHA256
557e968ddaccd8d3b75ebbe472eba1d2d805f9a20ce7f7b75d5e974142c8a06d

SHA512
dbd04f195efdb14d112d9a3bb66a7b83e09e6e067caf898567ede1c2ed3c40e86d39e4e731570ecc5528991b28fc20befe158b0927795eefede3c70c2719cdb4

Download Submit
\Users\Admin\AppData\Local\Temp\Steam Client WebHelper.exe
MD5
913967b216326e36a08010fb70f9dba3

SHA1
7b6f8c2eb5b443e03c212b85c2f0edb9c76ad2bf

SHA256
8d880758549220154d2ff4ee578f2b49527c5fb76a07d55237b61e30bcc09e3a

SHA512
c6fcb98d9fd509e9834fc3fba143bd36d41869cc104fbce5354951f0a6756156e34a30796baaa130dd45de3ed96e039ec14716716f6da4569915c7ef2d2b6c33

Download Submit
memory/292-92-0x0000000000000000-mapping.dmp

Download
memory/1084-60-0x0000000001F60000-0x0000000001F62000-memory.dmp

Filesize
8KB

Download
memory/1084-61-0x000007FEF2950000-0x000007FEF39E6000-memory.dmp

Filesize
16.6MB

Download
memory/1504-65-0x0000000000000000-mapping.dmp

Download
memory/1636-89-0x0000000000F20000-0x0000000000F21000-memory.dmp

Filesize
4KB

Download
memory/1636-85-0x0000000000000000-mapping.dmp

Download
memory/1688-97-0x0000000000000000-mapping.dmp

Download
memory/1688-103-0x000000001AF00000-0x000000001AF02000-memory.dmp

Filesize
8KB

Download
memory/1740-79-0x0000000000A90000-0x0000000000AA0000-memory.dmp

Filesize
64KB

Download
memory/1740-84-0x0000000001270000-0x000000000127C000-memory.dmp

Filesize
48KB

Download
memory/1740-83-0x000000001AE02000-0x000000001AE04000-memory.dmp

Filesize
8KB

Download
memory/1740-82-0x0000000000BF0000-0x0000000000C05000-memory.dmp

Filesize
84KB

Download
memory/1740-81-0x0000000001220000-0x0000000001268000-memory.dmp

Filesize
288KB

Download
memory/1740-80-0x0000000000A80000-0x0000000000A82000-memory.dmp

Filesize
8KB

Download
memory/1740-78-0x00000000002D0000-0x00000000002DC000-memory.dmp

Filesize
48KB

Download
memory/1740-77-0x0000000000470000-0x00000000004CA000-memory.dmp

Filesize
360KB

Download
memory/1740-76-0x000000001AE00000-0x000000001AE02000-memory.dmp

Filesize
8KB

Download
memory/1740-74-0x00000000012E0000-0x00000000012E1000-memory.dmp

Filesize
4KB

Download
memory/1740-96-0x000000001AE08000-0x000000001AE27000-memory.dmp

Filesize
124KB

Download
memory/1740-70-0x0000000000000000-mapping.dmp

Download
memory/2004-69-0x0000000002070000-0x0000000002072000-memory.dmp

Filesize
8KB

Download
memory/2004-62-0x0000000000000000-mapping.dmp

Download