xworm | b50d25c24ba5f1f096e883b3a9970d2c080afb37dfe2f55a25a1c7ed3ca36505

General

Target

SAMX222C.exe
Size

3.3MB
MD5

918951c4657e9cdf39ac1b275bfd2e95
SHA1

7323e59b2c4d60b6639bfcba11f4c02bcb94e347
SHA256

b50d25c24ba5f1f096e883b3a9970d2c080afb37dfe2f55a25a1c7ed3ca36505
SHA512

438c7554d8b72db63d598085b2c6fae9bfa1895154ebbaf96a5d2a498459b9a3516611613515f04dbc198edb8b2d7ce2ce63975064f28af63f3efa1e50e3e0d7
SSDEEP

98304:n5rc//PaUFOFWiRbNqz1xC4fkkbcZvqaVRn0:oi1Bc144M5vqaPn0

Score

10^/10

xworm discovery execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.23:25808

Attributes

Install_directory
%LocalAppData%
install_file
Realtek HD Audio Universal Service.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000c000000023b8e-5.dat	family_xworm
behavioral2/memory/2308-15-0x0000000000EF0000-0x0000000000F0A000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
3308	powershell.exe
3080	powershell.exe
4496	powershell.exe
640	powershell.exe

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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	SAMX222C.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Realtek HD Audio Universal Service.exe

Executes dropped EXE 2 IoCs

pid	Process
2308	Realtek HD Audio Universal Service.exe
3676	SAM X222C#.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Local\\Realtek HD Audio Universal Service.exe"	Realtek HD Audio Universal Service.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
16	ip-api.com

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 1 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	SAMX222C.exe

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	SAM X222C#.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer	SAM X222C#.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemVersion	SAM X222C#.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
640	powershell.exe
640	powershell.exe
3308	powershell.exe
3308	powershell.exe
3080	powershell.exe
3080	powershell.exe
4496	powershell.exe
4496	powershell.exe
2308	Realtek HD Audio Universal Service.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2308	Realtek HD Audio Universal Service.exe
Token: SeDebugPrivilege	3676	SAM X222C#.exe
Token: SeDebugPrivilege	640	powershell.exe
Token: SeDebugPrivilege	3308	powershell.exe
Token: SeDebugPrivilege	3080	powershell.exe
Token: SeDebugPrivilege	4496	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2308	Realtek HD Audio Universal Service.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2856 wrote to memory of 2308	2856	SAMX222C.exe	84
PID 2856 wrote to memory of 2308	2856	SAMX222C.exe	84
PID 2856 wrote to memory of 3676	2856	SAMX222C.exe	85
PID 2856 wrote to memory of 3676	2856	SAMX222C.exe	85
PID 2308 wrote to memory of 640	2308	Realtek HD Audio Universal Service.exe	94
PID 2308 wrote to memory of 640	2308	Realtek HD Audio Universal Service.exe	94
PID 2308 wrote to memory of 3308	2308	Realtek HD Audio Universal Service.exe	96
PID 2308 wrote to memory of 3308	2308	Realtek HD Audio Universal Service.exe	96
PID 2308 wrote to memory of 3080	2308	Realtek HD Audio Universal Service.exe	98
PID 2308 wrote to memory of 3080	2308	Realtek HD Audio Universal Service.exe	98
PID 2308 wrote to memory of 4496	2308	Realtek HD Audio Universal Service.exe	100
PID 2308 wrote to memory of 4496	2308	Realtek HD Audio Universal Service.exe	100

C:\Users\Admin\AppData\Local\Temp\SAMX222C.exe
"C:\Users\Admin\AppData\Local\Temp\SAMX222C.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2856
- C:\Users\Admin\AppData\Local\Temp\Realtek HD Audio Universal Service.exe
  "C:\Users\Admin\AppData\Local\Temp\Realtek HD Audio Universal Service.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2308
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Realtek HD Audio Universal Service.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:640
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Realtek HD Audio Universal Service.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3308
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Realtek HD Audio Universal Service.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3080
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Realtek HD Audio Universal Service.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4496
- C:\Users\Admin\AppData\Local\Temp\SAM X222C#.exe
  "C:\Users\Admin\AppData\Local\Temp\SAM X222C#.exe"
  2⤵
  - Executes dropped EXE
  - Enumerates system info in registry
  - Suspicious use of AdjustPrivilegeToken
  PID:3676

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
0e3b2fb1305afa355fb0585c068cdbbd

SHA1
b4e9457bfdc38337f64e3b2606aa34861aa6b4ed

SHA256
43a303fed06d5928800280cb0bf716790d9f886c87f26faf9fbdfa59b55e9c0d

SHA512
6a754dbb33c549ace5f71e169511422284f688c9df1c1e5fac8a633feac24312ba39fa4c682bdc9fe1d1162e2a3bd6190013652e567909417579db4b8791554d

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
e0499ccf2f5e6b93d5e6e1e1d06afe73

SHA1
a0169a2e3fccbe56b91a30c2df5abdc0850a0d58

SHA256
fdb232420c104c1e639dd928a694b0c00914355df693c9eaa80d6f4d409a1891

SHA512
fe7968e8097047c1167325a3bd98485362d4b421a82801b558229a90888012b427f0e64ead460625715fb2b9fea78b2435e5af3d083c192430f7844f198e922b

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
3f038ac2e2ceadad0f78317ea7de6881

SHA1
f2ee66d1ab22d5594426a26e9d2628ce29b037a7

SHA256
475591875182108710538a2ea21a89e0ffa1df43f776689288e0fa96da46efb7

SHA512
f751f1f06b79550af211a9bf39d59712bb60f4e2c79a24d850970b1d40e871c2e53ce84ed4f5d974dad53cdbfb95d38a8eff9f871f22ae2d3e772deb731715f4

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
6e09573715495338a569f0316d59af57

SHA1
1a9fd3073801c241b276cdb8b3d7035afbcd0c8d

SHA256
bdad2d4c1b3475754cb3b9ef41a9eda243f46e30117539f81399c977a459b570

SHA512
61add4e0cfef5f138e95f0d941c39c0bce038a47fbc262d5622a0fdf46621231653adfcca3b81bef3a662a37c288e1e9644bed44591551aea5399a370afaeced

Download Submit
C:\Users\Admin\AppData\Local\Temp\Realtek HD Audio Universal Service.exe

Filesize
79KB

MD5
066d90fb1d671648842a3b46622eb7ce

SHA1
6d0949bd4f494c9f8d80b705a79cfa9038c80e51

SHA256
8d2cf02c3005fb4bb7058df1f3a2e24b98077a8c5a8aab5c8184f4aa9ed951d8

SHA512
b22c8910e501de5fcb8e6197552396285366c9b43c4c6df4387b95a28830bf13a6ce634aadbf79e71b83879d19132c63414da5c5059edaa33be6bb71cee32745

Download Submit
C:\Users\Admin\AppData\Local\Temp\SAM X222C#.exe

Filesize
3.7MB

MD5
ad991add5af431b8d808cf9035a5cd46

SHA1
d7ac382fa834529219db1b76e4d928ff24f1245b

SHA256
a1dfdf32f2a82156bb3007896a9672fa05aba8ce4c668c3f4dce449a1a811a19

SHA512
b876e8380ab97dade3f875a7e0cee2dc598ba55143921bdd1f1d9d2d5be55c25d62b12aaef424227e1450f6ddf67a4e04e3f4fc846182abb842c4c821997cbbd

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_rjoj2q1y.gdg.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/640-32-0x0000025707560000-0x0000025707582000-memory.dmp

Filesize
136KB

Download
memory/2308-30-0x00007FFD417E0000-0x00007FFD422A1000-memory.dmp

Filesize
10.8MB

Download
memory/2308-15-0x0000000000EF0000-0x0000000000F0A000-memory.dmp

Filesize
104KB

Download
memory/2308-14-0x00007FFD417E3000-0x00007FFD417E5000-memory.dmp

Filesize
8KB

Download
memory/2308-78-0x00007FFD417E3000-0x00007FFD417E5000-memory.dmp

Filesize
8KB

Download
memory/2308-81-0x00007FFD417E0000-0x00007FFD422A1000-memory.dmp

Filesize
10.8MB

Download
memory/3676-29-0x00000220C6480000-0x00000220C64BC000-memory.dmp

Filesize
240KB

Download
memory/3676-27-0x00007FFD417E0000-0x00007FFD422A1000-memory.dmp

Filesize
10.8MB

Download
memory/3676-28-0x00000220C3670000-0x00000220C3884000-memory.dmp

Filesize
2.1MB

Download
memory/3676-26-0x00000220AAC40000-0x00000220AAC52000-memory.dmp

Filesize
72KB

Download
memory/3676-25-0x00007FFD417E0000-0x00007FFD422A1000-memory.dmp

Filesize
10.8MB

Download
memory/3676-24-0x00000220A8BD0000-0x00000220A8F94000-memory.dmp

Filesize
3.8MB

Download
memory/3676-79-0x00007FFD417E0000-0x00007FFD422A1000-memory.dmp

Filesize
10.8MB

Download
memory/3676-80-0x00007FFD417E0000-0x00007FFD422A1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads