Malware Analysis Report

2025-01-22 14:46

Sample ID 241126-ygk75asqgj
Target Sigma.exe
SHA256 cc9879ba8143f1ee15fd5400ea6632da1337970111467c362d7f0695c71d04d2
Tags
rat orcus discovery spyware stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

cc9879ba8143f1ee15fd5400ea6632da1337970111467c362d7f0695c71d04d2

Threat Level: Known bad

The file Sigma.exe was found to be: Known bad.

Malicious Activity Summary

rat orcus discovery spyware stealer

Orcus

Orcus family

Checks computer location settings

Executes dropped EXE

Loads dropped DLL

Drops desktop.ini file(s)

Drops file in Windows directory

System Location Discovery: System Language Discovery

Unsigned PE

Enumerates physical storage devices

Suspicious use of SendNotifyMessage

Suspicious use of AdjustPrivilegeToken

Suspicious use of FindShellTrayWindow

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-26 19:45

Signatures

Orcus family

orcus

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-26 19:45

Reported

2024-11-26 19:46

Platform

win7-20241010-en

Max time kernel

19s

Max time network

34s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Sigma.exe"

Signatures

Orcus

rat spyware stealer orcus

Orcus family

orcus

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Sigma.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\Sigma.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Sigma.exe

"C:\Users\Admin\AppData\Local\Temp\Sigma.exe"

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 during-interesting.gl.at.ply.gg udp
US 147.185.221.22:25798 during-interesting.gl.at.ply.gg tcp

Files

memory/2644-0-0x00000000745B1000-0x00000000745B2000-memory.dmp

memory/2644-1-0x00000000745B0000-0x0000000074B5B000-memory.dmp

memory/2644-2-0x00000000745B0000-0x0000000074B5B000-memory.dmp

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

MD5 d82971472daf0f83934006c25abb88f4
SHA1 85178be08ca3583d530a87ea789e9ae4a9490c17
SHA256 cc9879ba8143f1ee15fd5400ea6632da1337970111467c362d7f0695c71d04d2
SHA512 a4210167fc7c02508e708ee12bd52876413425046496fdeccd2a0313cf1260f651411a35cc2a6e5b65a30f5542aae75f1d1741d616ff79f93a48d9669e61e42f

memory/1144-12-0x00000000745B0000-0x0000000074B5B000-memory.dmp

memory/2644-11-0x00000000745B0000-0x0000000074B5B000-memory.dmp

memory/1144-13-0x00000000745B0000-0x0000000074B5B000-memory.dmp

memory/1144-14-0x00000000745B0000-0x0000000074B5B000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\Cab8F95.tmp

MD5 49aebf8cbd62d92ac215b2923fb1b9f5
SHA1 1723be06719828dda65ad804298d0431f6aff976
SHA256 b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
SHA512 bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

memory/1144-31-0x00000000745B0000-0x0000000074B5B000-memory.dmp

memory/1144-32-0x00000000745B0000-0x0000000074B5B000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-26 19:45

Reported

2024-11-26 19:48

Platform

win10v2004-20241007-en

Max time kernel

94s

Max time network

137s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Sigma.exe"

Signatures

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Sigma.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe N/A

Drops desktop.ini file(s)

Description Indicator Process Target
File created C:\Windows\assembly\Desktop.ini C:\Users\Admin\AppData\Local\Temp\Sigma.exe N/A
File opened for modification C:\Windows\assembly\Desktop.ini C:\Users\Admin\AppData\Local\Temp\Sigma.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\assembly C:\Users\Admin\AppData\Local\Temp\Sigma.exe N/A
File created C:\Windows\assembly\Desktop.ini C:\Users\Admin\AppData\Local\Temp\Sigma.exe N/A
File opened for modification C:\Windows\assembly\Desktop.ini C:\Users\Admin\AppData\Local\Temp\Sigma.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\Sigma.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Microsoft\Speech\AudioDriver.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Sigma.exe

"C:\Users\Admin\AppData\Local\Temp\Sigma.exe"

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 103.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 during-interesting.gl.at.ply.gg udp
US 147.185.221.22:25798 during-interesting.gl.at.ply.gg tcp
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 22.221.185.147.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 212.20.149.52.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 102.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 75.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp

Files

memory/4572-0-0x00000000754D2000-0x00000000754D3000-memory.dmp

memory/4572-1-0x00000000754D0000-0x0000000075A81000-memory.dmp

memory/4572-2-0x00000000754D0000-0x0000000075A81000-memory.dmp

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

MD5 d82971472daf0f83934006c25abb88f4
SHA1 85178be08ca3583d530a87ea789e9ae4a9490c17
SHA256 cc9879ba8143f1ee15fd5400ea6632da1337970111467c362d7f0695c71d04d2
SHA512 a4210167fc7c02508e708ee12bd52876413425046496fdeccd2a0313cf1260f651411a35cc2a6e5b65a30f5542aae75f1d1741d616ff79f93a48d9669e61e42f

memory/4136-18-0x00000000754D0000-0x0000000075A81000-memory.dmp

memory/4136-20-0x00000000754D0000-0x0000000075A81000-memory.dmp

memory/4572-19-0x00000000754D0000-0x0000000075A81000-memory.dmp

memory/4136-23-0x00000000754D0000-0x0000000075A81000-memory.dmp

memory/4136-24-0x00000000754D0000-0x0000000075A81000-memory.dmp

memory/4136-25-0x00000000754D0000-0x0000000075A81000-memory.dmp

memory/4136-27-0x00000000754D0000-0x0000000075A81000-memory.dmp