xworm | a87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876

General

Target
xa87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876.exe
Size 593KB
Sample260511-q84jsae15l
SHA256 a87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876
MD5 9c2bb83ba0a0d4d9f64437d36dbdad78
SHA1 481dd2115f8e64af02f743fa96f7e15a99a587e1
SHA512 b00a09fa7d3d3e52a02d3f9bddfca1e0baedc92a78f6727c6878ef10ad5b045abd69165b4f6cc15db10f5decb52093cb95d68758a38e8675aa5cabaadd7c896f
SSDEEP 12288:bYyDi5rNiQ7uysMFZzN/E/msymG1/mjuozCMGNUbToB:cyvgEGofO
TLSH
T126D47D27FF64B4F5C27F8C7486928601DB3578760761A6DFC3A8822A5E137E08E39E15
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

XWorm V5.6

Attributes

Install_directory
%LocalAppData%
install_file
USB.exe
pastebin_url
https://pastebin.com/raw/Fxzr3jeT

Signatures

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

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral1/files/0x000700000002447a-3.dat	family_xworm
behavioral1/memory/1040-12-0x0000000000790000-0x00000000007A6000-memory.dmp	family_xworm
behavioral1/memory/1040-17-0x00000000029B0000-0x00000000029C0000-memory.dmp	family_xworm

Drops startup file 2 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
1040	audiodg.exe

Modifies system executable filetype association 2 TTPs 3 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1546.001

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	xa87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\IsolatedCommand = "C:\\Users\\Admin\\Documents\\diagnostics\\shost.exe \"%1\" %*"	xa87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Users\\Admin\\Documents\\diagnostics\\shost.exe \"%1\" %*"	xa87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876.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-1-5-21-312252282-3884318443-358092420-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "C:\\Users\\Admin\\AppData\\Local\\winlogon"	audiodg.exe

Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs

Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

Web Service

T1102

flow	ioc
5	pastebin.com
6	pastebin.com

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

System Information Discovery
T1082

Modifies registry class 3 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Users\\Admin\\Documents\\diagnostics\\shost.exe \"%1\" %*"	xa87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command	xa87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\IsolatedCommand = "C:\\Users\\Admin\\Documents\\diagnostics\\shost.exe \"%1\" %*"	xa87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1040	audiodg.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 2484 wrote to memory of 1040	2484	xa87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876.exe	85

C:\Users\Admin\AppData\Local\Temp\xa87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876.exe
"C:\Users\Admin\AppData\Local\Temp\xa87c1b0a1bca9047db9cdc3d14be13cf634200a38bf7c4d6f7e2da8682bb7876.exe"
1⤵
- Modifies system executable filetype association
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2484
- C:\Users\Admin\Documents\diagnostics\audiodg.exe
  "C:\Users\Admin\Documents\diagnostics\audiodg.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  PID:1040

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Event Triggered Execution

1

T1546

Change Default File Association

1

T1546.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Event Triggered Execution

1

T1546

Change Default File Association

1

T1546.001

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

audiodg.exe

Path C:\Users\Admin\Documents\diagnostics\audiodg.exe
Size 62KB
SHA256 424c6c7fe4acc7be92fedd7917881e3ea45a080e8b8f7e7e3549117f603129c8
MD5 bc8b3aad1fa536ea527e4517e72b3968
SHA1 6e303239b9f693fac70dd2433b77b03a848ff074
SHA512 d43d65d83524ac233a9359834bb43a5981e93ad7e1e8ac07acf282975d5be951a6ac565a1ff9148c08311523175db54b117f3b9d62aff65e872685260cfbecfb
SSDEEP 1536:QAw5A/msOFIasSkD6nFHbAVecYpVwaExJO1EA+Bdd:QE/msrasdDOFHbAMCaExJO1Ebdd
TLSH
T102537C18BBE54129E1BF6FB159F53276DB39F7635903862F28C5028B1A23E85CD006F9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1040-12-0x0000000000790000-0x00000000007A6000-memory.dmp

Download

memory/1040-17-0x00000000029B0000-0x00000000029C0000-memory.dmp

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memory/1040-18-0x0000000001040000-0x000000000104C000-memory.dmp

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memory/1040-19-0x00000000029B0000-0x00000000029C0000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads