xworm | 03015c4f39849613a41ed43ed036ad274f80d005509177fcc902c80a36bb3fea

General

Target

BootstrapperFixer.exe
Size

74KB
MD5

aa65192e44a3bda4ea039571429abac5
SHA1

e1c8f9861e01d1b042d7267c5d7a6b7562f05c7f
SHA256

03015c4f39849613a41ed43ed036ad274f80d005509177fcc902c80a36bb3fea
SHA512

0e48d517c8730548497aba3fc99a1baa38f640e9f46f8061ac3f8dd9cb47eb5bfb0bb5daa24ef690225112b748b926ed3449623764f400b3aa2705f3987ffa3c
SSDEEP

1536:/AySegvs9JRF1AFF9lr9bWsn7D9U64CURikOh1ATt:/Ukj1AZ/bWODsCURikOLmt

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

uk-theory.gl.at.ply.gg:28001

Attributes

Install_directory
%ProgramData%
install_file
USB.exe

Signatures

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral1/memory/2084-1-0x0000000000A90000-0x0000000000AA8000-memory.dmp	family_xworm
behavioral1/files/0x000d000000015d0e-30.dat	family_xworm
behavioral1/memory/1780-36-0x0000000001380000-0x0000000001398000-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 3 IoCs

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

execution

PowerShell

T1059.001

pid	Process
1336	powershell.exe
2252	powershell.exe
1720	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\BootstrapperFixer.lnk	BootstrapperFixer.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\BootstrapperFixer.lnk	BootstrapperFixer.exe

Executes dropped EXE 2 IoCs

pid	Process
1780	BootstrapperFixer.exe
1900	BootstrapperFixer.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-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\BootstrapperFixer = "C:\\ProgramData\\BootstrapperFixer.exe"	BootstrapperFixer.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
4	ip-api.com

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

System Information Discovery
T1082

Modifies system certificate store 2 TTPs 2 IoCs

defense_evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8	BootstrapperFixer.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8\Blob = 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	BootstrapperFixer.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

T1053.005

pid	Process
2536	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1336	powershell.exe
2252	powershell.exe
1720	powershell.exe
2084	BootstrapperFixer.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	2084	BootstrapperFixer.exe
Token: SeDebugPrivilege	1336	powershell.exe
Token: SeDebugPrivilege	2252	powershell.exe
Token: SeDebugPrivilege	1720	powershell.exe
Token: SeDebugPrivilege	2084	BootstrapperFixer.exe
Token: SeDebugPrivilege	1780	BootstrapperFixer.exe
Token: SeDebugPrivilege	1900	BootstrapperFixer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2084	BootstrapperFixer.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2084 wrote to memory of 1336	2084	BootstrapperFixer.exe	31
PID 2084 wrote to memory of 1336	2084	BootstrapperFixer.exe	31
PID 2084 wrote to memory of 1336	2084	BootstrapperFixer.exe	31
PID 2084 wrote to memory of 2252	2084	BootstrapperFixer.exe	33
PID 2084 wrote to memory of 2252	2084	BootstrapperFixer.exe	33
PID 2084 wrote to memory of 2252	2084	BootstrapperFixer.exe	33
PID 2084 wrote to memory of 1720	2084	BootstrapperFixer.exe	35
PID 2084 wrote to memory of 1720	2084	BootstrapperFixer.exe	35
PID 2084 wrote to memory of 1720	2084	BootstrapperFixer.exe	35
PID 2084 wrote to memory of 2536	2084	BootstrapperFixer.exe	38
PID 2084 wrote to memory of 2536	2084	BootstrapperFixer.exe	38
PID 2084 wrote to memory of 2536	2084	BootstrapperFixer.exe	38
PID 1384 wrote to memory of 1780	1384	taskeng.exe	41
PID 1384 wrote to memory of 1780	1384	taskeng.exe	41
PID 1384 wrote to memory of 1780	1384	taskeng.exe	41
PID 1384 wrote to memory of 1900	1384	taskeng.exe	42
PID 1384 wrote to memory of 1900	1384	taskeng.exe	42
PID 1384 wrote to memory of 1900	1384	taskeng.exe	42

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\BootstrapperFixer.exe
"C:\Users\Admin\AppData\Local\Temp\BootstrapperFixer.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2084
- 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\BootstrapperFixer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1336
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'BootstrapperFixer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2252
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\BootstrapperFixer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1720
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "BootstrapperFixer" /tr "C:\ProgramData\BootstrapperFixer.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2536

C:\Windows\system32\taskeng.exe
taskeng.exe {9DFED764-45DE-4E6B-8186-EEAFD42ECE6B} S-1-5-21-1163522206-1469769407-485553996-1000:PJCSDMRP\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1384
- C:\ProgramData\BootstrapperFixer.exe
  C:\ProgramData\BootstrapperFixer.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1780
- C:\ProgramData\BootstrapperFixer.exe
  C:\ProgramData\BootstrapperFixer.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1900

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

2

T1112

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\BootstrapperFixer.exe

Filesize
74KB

MD5
aa65192e44a3bda4ea039571429abac5

SHA1
e1c8f9861e01d1b042d7267c5d7a6b7562f05c7f

SHA256
03015c4f39849613a41ed43ed036ad274f80d005509177fcc902c80a36bb3fea

SHA512
0e48d517c8730548497aba3fc99a1baa38f640e9f46f8061ac3f8dd9cb47eb5bfb0bb5daa24ef690225112b748b926ed3449623764f400b3aa2705f3987ffa3c

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
378895d7c006aa41d1c9584b8032255c

SHA1
99ddbdacc386a0c32920ca964439d5cab8ef7b63

SHA256
08618b19fce1aa19e60b4320f0ae3655492ebf16da2f7598afff09f3fca50722

SHA512
2614e1a70ba40b8c9f41b70fedf5693695d667e688dad404395412146add0b3034fa0a1bafa273f7829fb41df30732d9f272ba9fbfef7f61d6bdd383cd7d60ce

Download Submit
memory/1336-7-0x0000000002750000-0x00000000027D0000-memory.dmp

Filesize
512KB

Download
memory/1336-8-0x000000001B7D0000-0x000000001BAB2000-memory.dmp

Filesize
2.9MB

Download
memory/1336-9-0x0000000001E20000-0x0000000001E28000-memory.dmp

Filesize
32KB

Download
memory/1780-36-0x0000000001380000-0x0000000001398000-memory.dmp

Filesize
96KB

Download
memory/2084-2-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

Filesize
9.9MB

Download
memory/2084-0-0x000007FEF5D03000-0x000007FEF5D04000-memory.dmp

Filesize
4KB

Download
memory/2084-25-0x000007FEF5D03000-0x000007FEF5D04000-memory.dmp

Filesize
4KB

Download
memory/2084-1-0x0000000000A90000-0x0000000000AA8000-memory.dmp

Filesize
96KB

Download
memory/2084-32-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

Filesize
9.9MB

Download
memory/2252-15-0x000000001B790000-0x000000001BA72000-memory.dmp

Filesize
2.9MB

Download
memory/2252-16-0x0000000002290000-0x0000000002298000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads