xworm | e73c96538ec60c2117b6ed82b7f95f8894abed022ee9ab03c1be90ebd9722f06

General

Target

winlogoc.exe
Size

72KB
MD5

33fba80c2580eebf95e25dea03331f68
SHA1

d0ed67fbbff537eb393206fc41c18d59b9a4bb3c
SHA256

4cbe94aefe8a24ebac9fb5c11c1efc89c15b1a7b1a2bf3587baface318ee4b2b
SHA512

8213c45c68a38984a2ad11ab0651ae9933dc538ff260e31753f2f9c3aacff038048bcf2680bb7993b5f4005f48ae7e5c74e7325bdf6ef20df1ae7aa58f7ae4bc
SSDEEP

1536:UzF1OeqsJlPPf/TpX0bOc2yu/n+77QOI3taVwi4y:yFBibOL/nSsOI3tR5y

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

SLL.casacam.net:4444

Attributes

Install_directory
%LocalAppData%
install_file
Interrupi.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral6/memory/5008-1-0x0000000000080000-0x0000000000098000-memory.dmp	family_xworm
behavioral6/files/0x0008000000023c90-9.dat	family_xworm

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

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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	winlogoc.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 5 IoCs

pid	Process
4308	Interrupi.exe
1324	Interrupi.exe
2092	Interrupi.exe
4996	Interrupi.exe
1944	Interrupi.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-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Interrupi = "C:\\Users\\Admin\\AppData\\Local\\Interrupi.exe"	winlogoc.exe

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
3476	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
5008	winlogoc.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	5008	winlogoc.exe
Token: SeDebugPrivilege	5008	winlogoc.exe
Token: SeDebugPrivilege	4308	Interrupi.exe
Token: SeDebugPrivilege	1324	Interrupi.exe
Token: SeDebugPrivilege	2092	Interrupi.exe
Token: SeDebugPrivilege	4996	Interrupi.exe
Token: SeDebugPrivilege	1944	Interrupi.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 5008 wrote to memory of 3476	5008	winlogoc.exe	82
PID 5008 wrote to memory of 3476	5008	winlogoc.exe	82

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\winlogoc.exe
"C:\Users\Admin\AppData\Local\Temp\winlogoc.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5008
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Interrupi" /tr "C:\Users\Admin\AppData\Local\Interrupi.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3476

C:\Users\Admin\AppData\Local\Interrupi.exe
C:\Users\Admin\AppData\Local\Interrupi.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4308

C:\Users\Admin\AppData\Local\Interrupi.exe
C:\Users\Admin\AppData\Local\Interrupi.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1324

C:\Users\Admin\AppData\Local\Interrupi.exe
C:\Users\Admin\AppData\Local\Interrupi.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2092

C:\Users\Admin\AppData\Local\Interrupi.exe
C:\Users\Admin\AppData\Local\Interrupi.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4996

C:\Users\Admin\AppData\Local\Interrupi.exe
C:\Users\Admin\AppData\Local\Interrupi.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1944

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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:\Users\Admin\AppData\Local\Interrupi.exe

Filesize
72KB

MD5
33fba80c2580eebf95e25dea03331f68

SHA1
d0ed67fbbff537eb393206fc41c18d59b9a4bb3c

SHA256
4cbe94aefe8a24ebac9fb5c11c1efc89c15b1a7b1a2bf3587baface318ee4b2b

SHA512
8213c45c68a38984a2ad11ab0651ae9933dc538ff260e31753f2f9c3aacff038048bcf2680bb7993b5f4005f48ae7e5c74e7325bdf6ef20df1ae7aa58f7ae4bc

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

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
memory/4308-11-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/4308-13-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/5008-0-0x00007FF9DB8B3000-0x00007FF9DB8B5000-memory.dmp

Filesize
8KB

Download
memory/5008-1-0x0000000000080000-0x0000000000098000-memory.dmp

Filesize
96KB

Download
memory/5008-6-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/5008-7-0x00007FF9DB8B3000-0x00007FF9DB8B5000-memory.dmp

Filesize
8KB

Download
memory/5008-8-0x00007FF9DB8B0000-0x00007FF9DC371000-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