xworm | 5d3f76dc4c4191ac7baa3ba130abdce26bef47962e7c33645e0a30dd6635eeab

General

Target

fXWlfxf.exe
Size

270KB
MD5

b08e25b2e7527dd37baa4352cf143f81
SHA1

5da381243e460e32388f1f0f33988e98ff3cc38f
SHA256

5d3f76dc4c4191ac7baa3ba130abdce26bef47962e7c33645e0a30dd6635eeab
SHA512

2083a53f24c6061cfd6de5b486fe8794730ec964615e8e2dc009e1d5b0de8880f0f8bdb915c860bd79a34f0e8e4b76abc3aea10e36f36b4cabd1a93db1e27853
SSDEEP

3072:+qom4DMrhHWjYyEH4SeeSy7ZCyRlhGSrt1QEiaZiPm2s1P783FzHkAnOfGPxwq6T:+qomfYSerypDGSB1sqq6Ys0M

Score

10^/10

xworm discovery execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

83.151.14.2:9572

Mutex

qzYg48lemddFwWYK

Attributes

install_file
USB.exe

aes.plain

Signatures

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral2/memory/2500-1-0x0000000000400000-0x0000000000410000-memory.dmp	family_xworm
behavioral2/memory/2500-5-0x0000000000400000-0x0000000000410000-memory.dmp	family_xworm
behavioral2/memory/2500-3-0x0000000000400000-0x0000000000410000-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 2 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2160	powershell.exe
2164	powershell.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-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows SystemScheduler = "C:\\Users\\Admin\\AppData\\Local\\Microsoft\\Support\\SystemScheduler.exe"	fXWlfxf.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2956 set thread context of 2500	2956	fXWlfxf.exe	32

System Location Discovery: System Language Discovery 1 TTPs 3 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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AddInProcess32.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2500	AddInProcess32.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2160	powershell.exe
2164	powershell.exe
2500	AddInProcess32.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2500	AddInProcess32.exe
Token: SeDebugPrivilege	2160	powershell.exe
Token: SeDebugPrivilege	2164	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2500	AddInProcess32.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 2956 wrote to memory of 2500	2956	fXWlfxf.exe	32
PID 2956 wrote to memory of 2500	2956	fXWlfxf.exe	32
PID 2956 wrote to memory of 2500	2956	fXWlfxf.exe	32
PID 2956 wrote to memory of 2500	2956	fXWlfxf.exe	32
PID 2956 wrote to memory of 2500	2956	fXWlfxf.exe	32
PID 2956 wrote to memory of 2500	2956	fXWlfxf.exe	32
PID 2956 wrote to memory of 2500	2956	fXWlfxf.exe	32
PID 2956 wrote to memory of 2500	2956	fXWlfxf.exe	32
PID 2956 wrote to memory of 2500	2956	fXWlfxf.exe	32
PID 2500 wrote to memory of 2160	2500	AddInProcess32.exe	33
PID 2500 wrote to memory of 2160	2500	AddInProcess32.exe	33
PID 2500 wrote to memory of 2160	2500	AddInProcess32.exe	33
PID 2500 wrote to memory of 2160	2500	AddInProcess32.exe	33
PID 2500 wrote to memory of 2164	2500	AddInProcess32.exe	35
PID 2500 wrote to memory of 2164	2500	AddInProcess32.exe	35
PID 2500 wrote to memory of 2164	2500	AddInProcess32.exe	35
PID 2500 wrote to memory of 2164	2500	AddInProcess32.exe	35

C:\Users\Admin\AppData\Local\Temp\fXWlfxf.exe
"C:\Users\Admin\AppData\Local\Temp\fXWlfxf.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2956
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2500
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2160
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'AddInProcess32.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2164

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

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\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms

Filesize
7KB

MD5
d62ab29572c7f9524667dc31d8855a38

SHA1
b5cdb05043217a8515fe819cacce7de38166416d

SHA256
29726f178e533ae30093d2e41a08dfc88225dd653c7f5ff301c2b8e232bf2373

SHA512
86e684d49458f880eb32b223821672f9d075fd4e526de313d54d51634c1fb7cbe484761f4246fd7da6341e5138129b13ade1e2eee26b3c6987ba4c682b982377

Download Submit
memory/2500-1-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2500-5-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2500-3-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2500-6-0x0000000074C6E000-0x0000000074C6F000-memory.dmp

Filesize
4KB

Download
memory/2500-14-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download
memory/2500-15-0x0000000074C6E000-0x0000000074C6F000-memory.dmp

Filesize
4KB

Download
memory/2500-16-0x0000000074C60000-0x000000007534E000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads