xworm | cd9afdef9b69b501d2767b70792a481f1c768ba3585a53de167703fe250ab2b4

General

Target

XBASS.exe
Size

1.5MB
MD5

638e5f44f917de3b3b3473aafbde50b1
SHA1

8f48986374bcac52c2df6268bc0456864bbca12f
SHA256

7a0edc7a5d067e8df9bf44c4ef85d0e0bd9b4ae09a4569737480d1ca861f05e1
SHA512

62f916f131c65096c91c1674ed85e2903648f2c1772e785cc34d1bb9c40bb0126f0e3e1a3c0eb5e670d567a57db27af71fcb45658d38ee9c28792ce89256c637
SSDEEP

12288:jm6xXKTEXCwEapqeQYl+3e+C6HLn0E7C6P/:ZK4xqepl+3Vb00C6P/

Score

10^/10

xworm discovery evasion execution rat trojan

Malware Config

Extracted

Family

xworm

Version

3.1

C2

savelat19847.duckdns.org:7000

Mutex

69DII5G7d5Uac5Kb

Attributes

install_file
USB.exe

aes.plain

Signatures

Detect Xworm Payload 5 IoCs

resource	yara_rule
behavioral1/memory/2720-20-0x0000000000400000-0x000000000040E000-memory.dmp	family_xworm
behavioral1/memory/2720-19-0x0000000000400000-0x000000000040E000-memory.dmp	family_xworm
behavioral1/memory/2720-18-0x0000000000400000-0x000000000040E000-memory.dmp	family_xworm
behavioral1/memory/2720-13-0x0000000000400000-0x000000000040E000-memory.dmp	family_xworm
behavioral1/memory/2720-15-0x0000000000400000-0x000000000040E000-memory.dmp	family_xworm

UAC bypass 3 TTPs 1 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	XBASS.exe

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

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

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

execution

PowerShell

T1059.001

pid	Process
1032	powershell.exe
2884	powershell.exe
2068	powershell.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	XBASS.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	XBASS.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2688 set thread context of 2720	2688	XBASS.exe	34

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 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	installutil.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1032	powershell.exe
2884	powershell.exe
2068	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2688	XBASS.exe
Token: SeDebugPrivilege	1032	powershell.exe
Token: SeDebugPrivilege	2720	installutil.exe
Token: SeDebugPrivilege	2884	powershell.exe
Token: SeDebugPrivilege	2068	powershell.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 2688 wrote to memory of 1032	2688	XBASS.exe	32
PID 2688 wrote to memory of 1032	2688	XBASS.exe	32
PID 2688 wrote to memory of 1032	2688	XBASS.exe	32
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2720	2688	XBASS.exe	34
PID 2688 wrote to memory of 2604	2688	XBASS.exe	35
PID 2688 wrote to memory of 2604	2688	XBASS.exe	35
PID 2688 wrote to memory of 2604	2688	XBASS.exe	35
PID 2720 wrote to memory of 2884	2720	installutil.exe	36
PID 2720 wrote to memory of 2884	2720	installutil.exe	36
PID 2720 wrote to memory of 2884	2720	installutil.exe	36
PID 2720 wrote to memory of 2884	2720	installutil.exe	36
PID 2720 wrote to memory of 2068	2720	installutil.exe	38
PID 2720 wrote to memory of 2068	2720	installutil.exe	38
PID 2720 wrote to memory of 2068	2720	installutil.exe	38
PID 2720 wrote to memory of 2068	2720	installutil.exe	38

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	XBASS.exe

C:\Users\Admin\AppData\Local\Temp\XBASS.exe
"C:\Users\Admin\AppData\Local\Temp\XBASS.exe"
1⤵
- UAC bypass
- Checks whether UAC is enabled
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2688
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\XBASS.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1032
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\installutil.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\installutil.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2720
- - 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\installutil.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2884
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'installutil.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2068
- C:\Windows\system32\WerFault.exe
  C:\Windows\system32\WerFault.exe -u -p 2688 -s 696
  2⤵
  PID:2604

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

2

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\Roaming\Microsoft\Windows\Recent\CustomDestinations\N6VEI9M83U1150J3CVQM.temp

Filesize
7KB

MD5
fd2ceeeeff2164642be708ea47c20ede

SHA1
eca179f06e472cfb542dddb45a5da8a15eab71aa

SHA256
9107672e9f9ae09dd23a4447a2c00fdc72c014f87d8a57b08a6afe53981d88bb

SHA512
123325056a36fa4247d4c8d01e76af5aefaa0a63a6ecd823aa11ad7b3e90ca34e387d81329d85666dc0d4259d03a1ea6f0656753bec2f7acaa92338bc50a499a

Download Submit
memory/1032-22-0x0000000001EC0000-0x0000000001EC8000-memory.dmp

Filesize
32KB

Download
memory/1032-8-0x0000000002DB0000-0x0000000002E30000-memory.dmp

Filesize
512KB

Download
memory/1032-21-0x000000001B700000-0x000000001B9E2000-memory.dmp

Filesize
2.9MB

Download
memory/2688-0-0x000007FEF52E3000-0x000007FEF52E4000-memory.dmp

Filesize
4KB

Download
memory/2688-3-0x0000000001FF0000-0x0000000002050000-memory.dmp

Filesize
384KB

Download
memory/2688-30-0x000007FEF52E0000-0x000007FEF5CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2688-1-0x0000000000A60000-0x0000000000A68000-memory.dmp

Filesize
32KB

Download
memory/2688-2-0x000007FEF52E0000-0x000007FEF5CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2720-20-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2720-17-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2720-15-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2720-13-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2720-11-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2720-9-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2720-19-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2720-18-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads