xworm | ad34f6a17ee318591b59ac4fbc300c53808630e4f163b644a58eadc85057348a

General

Target

NetCat Loader.exe
Size

76KB
MD5

1a56b39b62cff3bf7a75a708f6a11762
SHA1

180d91a57ebb95a81bfaa394bca35c123efa916e
SHA256

ad34f6a17ee318591b59ac4fbc300c53808630e4f163b644a58eadc85057348a
SHA512

b86dfa4287e283fd7e734cc3897589c2bb6b98e35f1c82a6ab50f271baf8a9748a125a6c04425ccdf93566ddacb453290a9a63e5fc0d2797b70fb70b6dac03fb
SSDEEP

1536:JqDtM7DwroXh9bSQ6/jyrV9nmRWnXzWb6Alyj:EwblSlryrV9nmwPeyj

Score

10^/10

xworm discovery execution rat trojan

Malware Config

Extracted

Family

xworm

C2

194.59.31.87:1111

Attributes

install_file
USB.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral5/files/0x0009000000029ccb-6.dat	family_xworm
behavioral5/memory/2692-15-0x00000000001F0000-0x0000000000206000-memory.dmp	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 2 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4800	powershell.exe
3780	powershell.exe

Executes dropped EXE 3 IoCs

pid	Process
2692	System32.exe
964	dsoltr.exe
4460	bfwvnb.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
1	ip-api.com

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dsoltr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bfwvnb.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2584844841-1405471295-1760131749-1000_Classes\Local Settings	NetCat Loader.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2692	System32.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4800	powershell.exe
4800	powershell.exe
3780	powershell.exe
3780	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2692	System32.exe
Token: SeDebugPrivilege	4800	powershell.exe
Token: SeDebugPrivilege	3780	powershell.exe
Token: SeDebugPrivilege	2692	System32.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2256 wrote to memory of 2692	2256	NetCat Loader.exe	77
PID 2256 wrote to memory of 2692	2256	NetCat Loader.exe	77
PID 2256 wrote to memory of 5076	2256	NetCat Loader.exe	78
PID 2256 wrote to memory of 5076	2256	NetCat Loader.exe	78
PID 2692 wrote to memory of 4800	2692	System32.exe	80
PID 2692 wrote to memory of 4800	2692	System32.exe	80
PID 2692 wrote to memory of 3780	2692	System32.exe	82
PID 2692 wrote to memory of 3780	2692	System32.exe	82
PID 2692 wrote to memory of 964	2692	System32.exe	84
PID 2692 wrote to memory of 964	2692	System32.exe	84
PID 2692 wrote to memory of 964	2692	System32.exe	84
PID 2692 wrote to memory of 4460	2692	System32.exe	85
PID 2692 wrote to memory of 4460	2692	System32.exe	85
PID 2692 wrote to memory of 4460	2692	System32.exe	85

C:\Users\Admin\AppData\Local\Temp\NetCat Loader.exe
"C:\Users\Admin\AppData\Local\Temp\NetCat Loader.exe"
1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2256
- C:\Users\Admin\AppData\Roaming\System32.exe
  "C:\Users\Admin\AppData\Roaming\System32.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2692
- - 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\System32.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4800
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'System32.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3780
- - C:\Users\Admin\AppData\Local\Temp\dsoltr.exe
    "C:\Users\Admin\AppData\Local\Temp\dsoltr.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:964
- - C:\Users\Admin\AppData\Local\Temp\bfwvnb.exe
    "C:\Users\Admin\AppData\Local\Temp\bfwvnb.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4460
- C:\Windows\system32\NOTEPAD.EXE
  "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\Thanks For Using.txt
  2⤵
  PID:5076

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

Filesize
944B

MD5
d0a4a3b9a52b8fe3b019f6cd0ef3dad6

SHA1
fed70ce7834c3b97edbd078eccda1e5effa527cd

SHA256
21942e513f223fdad778348fbb20617dd29f986bccd87824c0ae7f15649f3f31

SHA512
1a66f837b4e7fb6346d0500aeacb44902fb8a239bce23416271263eba46fddae58a17075e188ae43eb516c841e02c87e32ebd73256c7cc2c0713d00c35f1761b

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4jw4tyol.zrl.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
245KB

MD5
601283c004aa6e4bcebfb6e844eb653c

SHA1
9c3dde5abd1056497f03f5ae5a3dc6ffed1028cf

SHA256
279a19315055e93a80c558bf9d9a7c8b4aba8fc8f8f3e812df8619e959abbcae

SHA512
feeaebc7c097c724f0cea539729729a7512eb0c75c45b7395cd1d7b3ab643f11fb8b941373b30b12d14b837ff53793fdf49fd70f524c9f6391285d62cf4a7c06

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

Filesize
116KB

MD5
567807ffd4dc5918c342138051a07902

SHA1
b2e19490673977db2442a10cab691f6bae2a07de

SHA256
a4ad6bb531bd8268d624f264910b15600f902fd634cef18a500c0f75a25a8042

SHA512
63f776e3df52662dab41e97fe934b08b590a055126db4ba6d829208d627e79ecc367da19e433e981d7f4ea8214d9114673bf10c1b3bd88c12bef63fdbf6379fc

Download Submit
C:\Users\Admin\AppData\Roaming\System32.exe

Filesize
63KB

MD5
66bbe5829a613fedad7f79e2c6273448

SHA1
57314396a65e08b7bfc5f0b8cdfa9a050579d9d9

SHA256
72499a032c26ef7031b942590e4dd2e28d60b332620c7d2dc42bc4b70995e0dd

SHA512
9b0ea0bb6a4a6ae75c6463f2bc3b5bd012a40a89f491868979230b850b948240b40326c703211edd349911e97a218bf77d01d06f254c33d83939c21a152efae3

Download Submit
C:\Users\Admin\AppData\Roaming\Thanks For Using.txt

Filesize
57B

MD5
f9cfd0c4da0a9a068f8a26ee31c85036

SHA1
ea75b71cfdf7364eacfafcaac0421f9c80a2b4e5

SHA256
e52f33ee65ceb7e5fe9cd47744888c089c37ba7dbadeaf345e75b5cadd43ee2d

SHA512
f81823ed92d8f5aa299d0164f59fb77a3af4c6a9ca5a98e0d4b33104ec7f15ef19037d4bb4f3b2c8c1ca156bac2253f5052eb801468db73d71a67b10405e4b51

Download Submit
memory/2256-1-0x0000000000B20000-0x0000000000B3A000-memory.dmp

Filesize
104KB

Download
memory/2256-0-0x00007FFBD8453000-0x00007FFBD8455000-memory.dmp

Filesize
8KB

Download
memory/2692-15-0x00000000001F0000-0x0000000000206000-memory.dmp

Filesize
88KB

Download
memory/2692-41-0x00007FFBD8450000-0x00007FFBD8F12000-memory.dmp

Filesize
10.8MB

Download
memory/2692-50-0x000000001B9F0000-0x000000001B9FC000-memory.dmp

Filesize
48KB

Download
memory/2692-18-0x00007FFBD8450000-0x00007FFBD8F12000-memory.dmp

Filesize
10.8MB

Download
memory/4800-27-0x0000028FA6430000-0x0000028FA6452000-memory.dmp

Filesize
136KB

Download

Analysis

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