xworm | b46624ea261bec807dc1f93431ab3156450646976443c27322a7a9c4eec5e5f0 | Triage

Resubmissions

13-01-2025 01:00

250113-bcnq5axqbt 10

09-01-2025 12:16

250109-pfhwyazjhs 10

06-01-2025 14:21

250106-rpb6vs1kgr 10

02-01-2025 20:47

250102-zlagvsvpdv 10

02-01-2025 20:45

250102-zjvd9ayjar 10

Analysis

max time kernel
423s
max time network
428s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
09-01-2025 12:16

Sharing

Reason

Machine shutdown

Report Analysis Logs

General

Target

Firefox Installer (ratted).exe
Size

170KB
MD5

200eb10c73336127006740ae06003933
SHA1

32ef06528018d4f9fc8da3a7e7e07363b3a143f4
SHA256

b46624ea261bec807dc1f93431ab3156450646976443c27322a7a9c4eec5e5f0
SHA512

026eb0e018f25449f664dbc2655cfb5c360fd60a928fec344bd31b3cefa01a3fcce4dd1fc87b3aabce7557db57cb1247a1984c69b3ecb00d83f388fd6b09a0ce
SSDEEP

1536:4ig4nFL9z2BOwVCMs6se7llqn17KineXd2wVKtivEYoNRh8RX9EIKhI49No:5zFL9zWOw7sgbcUieNJqKoPC5+Lm

Score

10^/10

xworm rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

109.231.31.129:2021

Mutex

H7HNKbba3h7eEPOa

Attributes

Install_directory
%AppData%
install_file
FlrefoxUpdate.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/2796-1-0x0000000000C40000-0x0000000000C70000-memory.dmp	family_xworm
behavioral2/files/0x000b000000023b5c-6.dat	family_xworm

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	Firefox Installer (ratted).exe

Executes dropped EXE 7 IoCs

pid	Process
3696	FlrefoxUpdate.exe
4412	FlrefoxUpdate.exe
2692	FlrefoxUpdate.exe
4672	FlrefoxUpdate.exe
2932	FlrefoxUpdate.exe
2948	FlrefoxUpdate.exe
2736	FlrefoxUpdate.exe

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

System Information Discovery
T1082

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "226"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
1444	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2796	Firefox Installer (ratted).exe

Suspicious use of AdjustPrivilegeToken 11 IoCs

description	pid	Process
Token: SeDebugPrivilege	2796	Firefox Installer (ratted).exe
Token: SeDebugPrivilege	2796	Firefox Installer (ratted).exe
Token: SeDebugPrivilege	3696	FlrefoxUpdate.exe
Token: SeDebugPrivilege	4412	FlrefoxUpdate.exe
Token: SeDebugPrivilege	2692	FlrefoxUpdate.exe
Token: SeDebugPrivilege	4672	FlrefoxUpdate.exe
Token: SeDebugPrivilege	2932	FlrefoxUpdate.exe
Token: SeDebugPrivilege	2948	FlrefoxUpdate.exe
Token: SeDebugPrivilege	2736	FlrefoxUpdate.exe
Token: SeShutdownPrivilege	1432	shutdown.exe
Token: SeRemoteShutdownPrivilege	1432	shutdown.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2796	Firefox Installer (ratted).exe
4952	LogonUI.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2796 wrote to memory of 1444	2796	Firefox Installer (ratted).exe	84
PID 2796 wrote to memory of 1444	2796	Firefox Installer (ratted).exe	84
PID 2796 wrote to memory of 1432	2796	Firefox Installer (ratted).exe	102
PID 2796 wrote to memory of 1432	2796	Firefox Installer (ratted).exe	102

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Firefox Installer (ratted).exe
"C:\Users\Admin\AppData\Local\Temp\Firefox Installer (ratted).exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2796
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "FlrefoxUpdate" /tr "C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1444
- C:\Windows\SYSTEM32\shutdown.exe
  shutdown.exe /f /s /t 0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1432

C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3696

C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4412

C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2692

C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4672

C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2932

C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2948

C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2736

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa399f055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:4952

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Scheduled Task/Job

Scheduled Task

Defense Evasion

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
C:\Users\Admin\AppData\Roaming\FlrefoxUpdate.exe

Filesize
170KB

MD5
200eb10c73336127006740ae06003933

SHA1
32ef06528018d4f9fc8da3a7e7e07363b3a143f4

SHA256
b46624ea261bec807dc1f93431ab3156450646976443c27322a7a9c4eec5e5f0

SHA512
026eb0e018f25449f664dbc2655cfb5c360fd60a928fec344bd31b3cefa01a3fcce4dd1fc87b3aabce7557db57cb1247a1984c69b3ecb00d83f388fd6b09a0ce

Download Submit
memory/2796-0-0x00007FFA29163000-0x00007FFA29165000-memory.dmp

Filesize
8KB

Download
memory/2796-1-0x0000000000C40000-0x0000000000C70000-memory.dmp

Filesize
192KB

Download
memory/2796-3-0x00007FFA29160000-0x00007FFA29C21000-memory.dmp

Filesize
10.8MB

Download
memory/2796-4-0x00007FFA29163000-0x00007FFA29165000-memory.dmp

Filesize
8KB

Download
memory/2796-5-0x00007FFA29160000-0x00007FFA29C21000-memory.dmp

Filesize
10.8MB

Download
memory/2796-18-0x00007FFA29160000-0x00007FFA29C21000-memory.dmp

Filesize
10.8MB

Download
memory/3696-8-0x00007FFA29160000-0x00007FFA29C21000-memory.dmp

Filesize
10.8MB

Download
memory/3696-10-0x00007FFA29160000-0x00007FFA29C21000-memory.dmp

Filesize
10.8MB

Download