xworm | d2347ef2b7dcc437febfc6d5716072dcd9faeda6afaf70f4795454c3da6d1240

General

Target

Solara.exe
Size

39KB
MD5

6857da68ff8f6f4d2a5ccf084a986cd8
SHA1

c77e9eb10f80f0af86e5b1fb58e383fcb7c9127b
SHA256

d2347ef2b7dcc437febfc6d5716072dcd9faeda6afaf70f4795454c3da6d1240
SHA512

3aca870813c74669ed358e39272136279f48f04c101617653c4309055b97d958e792df0dfdaa34f82f6552fa73a8705e7750c93ad5f8965956851e6878ab989c
SSDEEP

768:t4SnFmvYC9ehSPthRctwzoFd9waOphwjtYir:tT5gehSjOFd9waOpYhr

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

Mutex

ijf3Un99PlWRIuIV

Attributes

Install_directory
%AppData%
install_file
svchost.exe
pastebin_url
https://pastebin.com/raw/FgmKAhUD

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/4824-1-0x0000000000BE0000-0x0000000000BF0000-memory.dmp	family_xworm
behavioral2/files/0x000400000001e710-8.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-1-5-21-22591836-1183090055-1220658180-1000\Control Panel\International\Geo\Nation	Solara.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
4528	svchost.exe
3088	svchost.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-1-5-21-22591836-1183090055-1220658180-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe"	Solara.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
23	pastebin.com
24	pastebin.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
2936	schtasks.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4824	Solara.exe
Token: SeDebugPrivilege	4528	svchost.exe
Token: SeDebugPrivilege	3088	svchost.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4824 wrote to memory of 2936	4824	Solara.exe	93
PID 4824 wrote to memory of 2936	4824	Solara.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\Solara.exe
"C:\Users\Admin\AppData\Local\Temp\Solara.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4824
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchost" /tr "C:\Users\Admin\AppData\Roaming\svchost.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2936

C:\Users\Admin\AppData\Roaming\svchost.exe
C:\Users\Admin\AppData\Roaming\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4528

C:\Users\Admin\AppData\Roaming\svchost.exe
C:\Users\Admin\AppData\Roaming\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3088

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\svchost.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
C:\Users\Admin\AppData\Roaming\svchost.exe

Filesize
39KB

MD5
6857da68ff8f6f4d2a5ccf084a986cd8

SHA1
c77e9eb10f80f0af86e5b1fb58e383fcb7c9127b

SHA256
d2347ef2b7dcc437febfc6d5716072dcd9faeda6afaf70f4795454c3da6d1240

SHA512
3aca870813c74669ed358e39272136279f48f04c101617653c4309055b97d958e792df0dfdaa34f82f6552fa73a8705e7750c93ad5f8965956851e6878ab989c

Download Submit
memory/4528-10-0x00007FF9CF0F0000-0x00007FF9CFBB1000-memory.dmp

Filesize
10.8MB

Download
memory/4528-12-0x00007FF9CF0F0000-0x00007FF9CFBB1000-memory.dmp

Filesize
10.8MB

Download
memory/4824-0-0x00007FF9CF0F3000-0x00007FF9CF0F5000-memory.dmp

Filesize
8KB

Download
memory/4824-1-0x0000000000BE0000-0x0000000000BF0000-memory.dmp

Filesize
64KB

Download
memory/4824-6-0x00007FF9CF0F0000-0x00007FF9CFBB1000-memory.dmp

Filesize
10.8MB

Download
memory/4824-7-0x00007FF9CF0F0000-0x00007FF9CFBB1000-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