orcus | 676fdc85814c991074766a302aca8f6ffbd3e35f6564b841cb712010ccd8d816

Resubmissions

09-01-2025 16:41

250109-t64csawrek 10

09-01-2025 16:37

250109-t4tessvjh1 10

09-01-2025 16:31

250109-t1qjqswqdr 10

Analysis

max time kernel
140s
max time network
149s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
09-01-2025 16:31

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General

Target

Sigmaalpha.exe
Size

839KB
MD5

6f93bf5bd25cf58c2756121371d1bb3f
SHA1

d7fdff4e6c355add9a58bf54d66d420c97f8a9a9
SHA256

676fdc85814c991074766a302aca8f6ffbd3e35f6564b841cb712010ccd8d816
SHA512

2def16daf5c7bfe838d4a9438554df2d07fd8d93c0d090e0d099b95a19e9f8b2aba3b810f845a4b90640856d6db0343c0335ef5eb288dc62ed4f22f806678e8e
SSDEEP

24576:mBS04YNEMuExDiU6E5R9s8xY/2l/dGtnIbt+rn:mj4auS+UjfU2TGdIbt+r

Score

10^/10

orcus discovery rat spyware stealer

Malware Config

Extracted

Family

orcus

?sleepyyasian-37412.portmap.host

Mutex

2090259f0fa14cd3a6f3cc0c0c16b96e

Attributes

administration_rights_required
false
anti_debugger
false
anti_tcp_analyzer
false
antivm
false
autostart_method
1
change_creation_date
false
force_installer_administrator_privileges
false
hide_file
false
install
false
installation_folder
%appdata%\Microsoft\Speech\AudioDriver.exe
installservice
false
keylogger_enabled
false
newcreationdate
01/09/2025 13:00:20
plugins
AgEAAA==
reconnect_delay
10000
registry_autostart_keyname
Audio HD Driver
registry_hidden_autostart
false
set_admin_flag
false
tasksch_name
Audio HD Driver
tasksch_request_highest_privileges
false
try_other_autostart_onfail
false

aes.plain

Signatures

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

Checks computer location settings 2 TTPs 1 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-1-5-21-1669812756-2240353048-2660728061-1000\Control Panel\International\Geo\Nation	Sigmaalpha.exe

Executes dropped EXE 1 IoCs

pid	Process
2860	AudioDriver.exe

Drops desktop.ini file(s) 2 IoCs

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

Drops file in Windows directory 3 IoCs

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

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

System Information Discovery
T1082

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	Sigmaalpha.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AudioDriver.exe

Suspicious behavior: EnumeratesProcesses 36 IoCs

pid	Process
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe
2860	AudioDriver.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2860	AudioDriver.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2860	AudioDriver.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2860	AudioDriver.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3488 wrote to memory of 2860	3488	Sigmaalpha.exe	80
PID 3488 wrote to memory of 2860	3488	Sigmaalpha.exe	80
PID 3488 wrote to memory of 2860	3488	Sigmaalpha.exe	80

C:\Users\Admin\AppData\Local\Temp\Sigmaalpha.exe
"C:\Users\Admin\AppData\Local\Temp\Sigmaalpha.exe"
1⤵
- Checks computer location settings
- Drops desktop.ini file(s)
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3488
- C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  PID:2860

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe

Filesize
839KB

MD5
6f93bf5bd25cf58c2756121371d1bb3f

SHA1
d7fdff4e6c355add9a58bf54d66d420c97f8a9a9

SHA256
676fdc85814c991074766a302aca8f6ffbd3e35f6564b841cb712010ccd8d816

SHA512
2def16daf5c7bfe838d4a9438554df2d07fd8d93c0d090e0d099b95a19e9f8b2aba3b810f845a4b90640856d6db0343c0335ef5eb288dc62ed4f22f806678e8e

Download Submit
memory/2860-8-0x0000000074E70000-0x0000000075421000-memory.dmp

Filesize
5.7MB

Download
memory/2860-9-0x0000000074E70000-0x0000000075421000-memory.dmp

Filesize
5.7MB

Download
memory/2860-10-0x0000000074E70000-0x0000000075421000-memory.dmp

Filesize
5.7MB

Download
memory/2860-11-0x0000000074E70000-0x0000000075421000-memory.dmp

Filesize
5.7MB

Download
memory/3488-0-0x0000000074E72000-0x0000000074E73000-memory.dmp

Filesize
4KB

Download
memory/3488-1-0x0000000074E70000-0x0000000075421000-memory.dmp

Filesize
5.7MB

Download
memory/3488-2-0x0000000074E70000-0x0000000075421000-memory.dmp

Filesize
5.7MB

Download
memory/3488-7-0x0000000074E70000-0x0000000075421000-memory.dmp

Filesize
5.7MB

Download