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 2 IoCs

resource	yara_rule
behavioral2/memory/2212-1-0x0000000000A20000-0x0000000000A38000-memory.dmp	family_xworm
behavioral2/files/0x000b000000023b8e-49.dat	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
2752	powershell.exe
2780	powershell.exe
4412	powershell.exe

Checks computer location settings 2 TTPs 1 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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	BootstrapperFixer.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 3 IoCs

pid	Process
628	BootstrapperFixer.exe
656	BootstrapperFixer.exe
4948	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-1-5-21-3350944739-639801879-157714471-1000\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
11	ip-api.com

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

System Information Discovery
T1082

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
4824	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2752	powershell.exe
2752	powershell.exe
2780	powershell.exe
2780	powershell.exe
4412	powershell.exe
4412	powershell.exe
2212	BootstrapperFixer.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	2212	BootstrapperFixer.exe
Token: SeDebugPrivilege	2752	powershell.exe
Token: SeDebugPrivilege	2780	powershell.exe
Token: SeDebugPrivilege	4412	powershell.exe
Token: SeDebugPrivilege	2212	BootstrapperFixer.exe
Token: SeDebugPrivilege	628	BootstrapperFixer.exe
Token: SeDebugPrivilege	656	BootstrapperFixer.exe
Token: SeDebugPrivilege	4948	BootstrapperFixer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2212	BootstrapperFixer.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2212 wrote to memory of 2752	2212	BootstrapperFixer.exe	85
PID 2212 wrote to memory of 2752	2212	BootstrapperFixer.exe	85
PID 2212 wrote to memory of 2780	2212	BootstrapperFixer.exe	87
PID 2212 wrote to memory of 2780	2212	BootstrapperFixer.exe	87
PID 2212 wrote to memory of 4412	2212	BootstrapperFixer.exe	89
PID 2212 wrote to memory of 4412	2212	BootstrapperFixer.exe	89
PID 2212 wrote to memory of 4824	2212	BootstrapperFixer.exe	93
PID 2212 wrote to memory of 4824	2212	BootstrapperFixer.exe	93

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⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2212
- 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:2752
- 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:2780
- 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:4412
- 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:4824

C:\ProgramData\BootstrapperFixer.exe
C:\ProgramData\BootstrapperFixer.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:628

C:\ProgramData\BootstrapperFixer.exe
C:\ProgramData\BootstrapperFixer.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:656

C:\ProgramData\BootstrapperFixer.exe
C:\ProgramData\BootstrapperFixer.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4948

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

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

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\Local\Microsoft\CLR_v4.0\UsageLogs\BootstrapperFixer.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
944B

MD5
67e8893616f805af2411e2f4a1411b2a

SHA1
39bf1e1a0ddf46ce7c136972120f512d92827dcd

SHA256
ca0dfe104c1bf27f7e01999fcdabc16c6400c3da937c832c26bdbca322381d31

SHA512
164e911a9935e75c8be1a6ec3d31199a16ba2a1064da6c09d771b2a38dd7fddd142301ef55d67d90f306d3a454a1ce7b72e129ea42e44500b9b8c623a8d98b4d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ra1esu40.iyw.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2212-1-0x0000000000A20000-0x0000000000A38000-memory.dmp

Filesize
96KB

Download
memory/2212-2-0x00007FFCC2610000-0x00007FFCC30D1000-memory.dmp

Filesize
10.8MB

Download
memory/2212-0-0x00007FFCC2613000-0x00007FFCC2615000-memory.dmp

Filesize
8KB

Download
memory/2212-51-0x00007FFCC2610000-0x00007FFCC30D1000-memory.dmp

Filesize
10.8MB

Download
memory/2212-44-0x00007FFCC2613000-0x00007FFCC2615000-memory.dmp

Filesize
8KB

Download
memory/2752-13-0x00000264AA6F0000-0x00000264AA712000-memory.dmp

Filesize
136KB

Download
memory/2752-18-0x00007FFCC2610000-0x00007FFCC30D1000-memory.dmp

Filesize
10.8MB

Download
memory/2752-15-0x00007FFCC2610000-0x00007FFCC30D1000-memory.dmp

Filesize
10.8MB

Download
memory/2752-14-0x00007FFCC2610000-0x00007FFCC30D1000-memory.dmp

Filesize
10.8MB

Download
memory/2752-3-0x00007FFCC2610000-0x00007FFCC30D1000-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