xworm | a272b0c9c1ef29b030408018c792c43d5f8f0b2b43142af5cb52bcfba899e4c7

General

Target

Solara v4.exe
Size

327KB
MD5

e8bcc353f4f717e0a9ec8df42c34beb4
SHA1

56b5eedbe3ecc2c44a887bbd1f2d9dbb4a9ed97c
SHA256

a272b0c9c1ef29b030408018c792c43d5f8f0b2b43142af5cb52bcfba899e4c7
SHA512

0c6efe15d37163e96551915bef458b91c29ef79712e3d4c4b18272acaa33538af74f6515cd63be622005aded238c761010778e0af8dea4adfdec3ef7c587fd84
SSDEEP

6144:n98Spzgs21x/GJqkntASwQvJzp8kRJoKXqwUHrsTB2zs+FAWKiXG/D8Sf7KVyBs:+Kgs2X/gDiVBQTB2zI6S8SW8Bs

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

3.0

C2

silver-bowl.gl.at.ply.gg:29206

Attributes

Install_directory
%AppData%
install_file
USB.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000600000001d8b1-7.dat	family_xworm
behavioral2/memory/860-26-0x0000000000050000-0x0000000000068000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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
2628	powershell.exe
4996	powershell.exe
2248	powershell.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	Solara v4.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\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\Solara.lnk	Solara.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Solara.lnk	Solara.exe

Executes dropped EXE 2 IoCs

pid	Process
860	Solara.exe
3000	Bootstrapper v4.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Solara = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Solara.exe"	Solara v4.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Bootstrapper v4 = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Bootstrapper v4.exe"	Solara v4.exe

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

Web Service

T1102

flow	ioc
24	pastebin.com
21	pastebin.com

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
22	ip-api.com

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2628	powershell.exe
2628	powershell.exe
4996	powershell.exe
4996	powershell.exe
2248	powershell.exe
2248	powershell.exe
860	Solara.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	860	Solara.exe
Token: SeDebugPrivilege	3000	Bootstrapper v4.exe
Token: SeDebugPrivilege	2628	powershell.exe
Token: SeDebugPrivilege	4996	powershell.exe
Token: SeDebugPrivilege	2248	powershell.exe
Token: SeDebugPrivilege	860	Solara.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
860	Solara.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1976 wrote to memory of 860	1976	Solara v4.exe	89
PID 1976 wrote to memory of 860	1976	Solara v4.exe	89
PID 1976 wrote to memory of 3000	1976	Solara v4.exe	90
PID 1976 wrote to memory of 3000	1976	Solara v4.exe	90
PID 860 wrote to memory of 2628	860	Solara.exe	96
PID 860 wrote to memory of 2628	860	Solara.exe	96
PID 860 wrote to memory of 4996	860	Solara.exe	98
PID 860 wrote to memory of 4996	860	Solara.exe	98
PID 860 wrote to memory of 2248	860	Solara.exe	101
PID 860 wrote to memory of 2248	860	Solara.exe	101

C:\Users\Admin\AppData\Local\Temp\Solara v4.exe
"C:\Users\Admin\AppData\Local\Temp\Solara v4.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1976
- C:\Users\Admin\AppData\Local\Temp\Solara.exe
  "C:\Users\Admin\AppData\Local\Temp\Solara.exe"
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:860
- - 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\Solara.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2628
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Solara.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4996
- - 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\Roaming\Solara.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2248
- C:\Users\Admin\AppData\Local\Temp\Bootstrapper v4.exe
  "C:\Users\Admin\AppData\Local\Temp\Bootstrapper v4.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:3000

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

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\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
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

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

Filesize
944B

MD5
ba169f4dcbbf147fe78ef0061a95e83b

SHA1
92a571a6eef49fff666e0f62a3545bcd1cdcda67

SHA256
5ef1421e19fde4bc03cd825dd7d6c0e7863f85fd8f0aa4a4d4f8d555dc7606d1

SHA512
8d2e5e552210dcda684682538bc964fdd8a8ff5b24cc2cc8af813729f0202191f98eb42d38d2355df17ae620fe401aad6ceaedaed3b112fdacd32485a3a0c07c

Download Submit
C:\Users\Admin\AppData\Local\Temp\Bootstrapper v4.exe

Filesize
796KB

MD5
4b94b989b0fe7bec6311153b309dfe81

SHA1
bb50a4bb8a66f0105c5b74f32cd114c672010b22

SHA256
7c4283f5e620b2506bcb273f947def4435d95e143ae3067a783fd3adc873a659

SHA512
fbbe60cf3e5d028d906e7d444b648f7dff8791c333834db8119e0a950532a75fda2e9bd5948f0b210904667923eb7b2c0176140babc497955d227e7d80fb109d

Download Submit
C:\Users\Admin\AppData\Local\Temp\Solara.exe

Filesize
69KB

MD5
5b4fbede12d2186702efdc865fcd2525

SHA1
851d03d19d187440056cc694d5c3598133e080ff

SHA256
d16034eb1f8fa2ead62e9128109de6188156c6926665188958fa7fe2c3e0a63e

SHA512
791ee49dd5848908cb658982557702c8164f538e325fec272ca5388bdd7f09b808c5b3f743ea198fc989a4373c7e435e9108121a1aee210b6fc898034d9c1516

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xpupe5a5.2hy.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/860-26-0x0000000000050000-0x0000000000068000-memory.dmp

Filesize
96KB

Download
memory/860-33-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download
memory/860-75-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download
memory/860-73-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download
memory/860-25-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download
memory/1976-1-0x0000000000460000-0x00000000004B6000-memory.dmp

Filesize
344KB

Download
memory/1976-0-0x00007FFA20C73000-0x00007FFA20C75000-memory.dmp

Filesize
8KB

Download
memory/1976-3-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download
memory/1976-27-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download
memory/3000-34-0x0000022350560000-0x0000022350582000-memory.dmp

Filesize
136KB

Download
memory/3000-31-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download
memory/3000-30-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download
memory/3000-74-0x00007FFA20C70000-0x00007FFA21731000-memory.dmp

Filesize
10.8MB

Download
memory/3000-29-0x000002234E890000-0x000002234E95E000-memory.dmp

Filesize
824KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads