xworm | c66c187f9ad62af25514cd5cb0389ac62dd7f18c8de86554500a961a485f6ab3

General

Target

amongys.exe
Size

78KB
MD5

ac27e93eee9c6e2f3922cd874fd8a4f7
SHA1

b571a07df2e9142094a16ba5fdb6c0b240518362
SHA256

c66c187f9ad62af25514cd5cb0389ac62dd7f18c8de86554500a961a485f6ab3
SHA512

58ed067f233f2f81e3872e01222d27b75390871c344f04ba577a7daa20beaa197677b5d75d1b4d605cd77f1ae2dc655d006db25dbab0d6f6ffdd134987cd187a
SSDEEP

1536:U/lUh43+M1iaxGqX/fvJ64ycsW53pwZPjg3fO7a9Px//tB9:j7cXGqPfvJcgqQLPx//tB9

Score

10^/10

xworm discovery execution rat trojan

Malware Config

Extracted

Family

xworm

C2

IDKTOBEHONESTNIGAS-56344.portmap.io:56344

Attributes

Install_directory
%LocalAppData%
install_file
svchost.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/1072-11-0x0000000000400000-0x0000000000416000-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 1 IoCs

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

execution

PowerShell

T1059.001

pid	Process
3400	powershell.exe

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-1-5-21-2449540194-3226363261-2578591490-1000\Control Panel\International\Geo\Nation	RegAsm.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
22	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4672 set thread context of 1072	4672	amongys.exe	92

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 3 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	amongys.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4672	amongys.exe
4672	amongys.exe
4672	amongys.exe
4672	amongys.exe
4672	amongys.exe
4672	amongys.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4672	amongys.exe
Token: SeDebugPrivilege	1072	RegAsm.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 4672 wrote to memory of 2608	4672	amongys.exe	89
PID 4672 wrote to memory of 2608	4672	amongys.exe	89
PID 4672 wrote to memory of 2608	4672	amongys.exe	89
PID 4672 wrote to memory of 4388	4672	amongys.exe	90
PID 4672 wrote to memory of 4388	4672	amongys.exe	90
PID 4672 wrote to memory of 4388	4672	amongys.exe	90
PID 4672 wrote to memory of 1976	4672	amongys.exe	91
PID 4672 wrote to memory of 1976	4672	amongys.exe	91
PID 4672 wrote to memory of 1976	4672	amongys.exe	91
PID 4672 wrote to memory of 1072	4672	amongys.exe	92
PID 4672 wrote to memory of 1072	4672	amongys.exe	92
PID 4672 wrote to memory of 1072	4672	amongys.exe	92
PID 4672 wrote to memory of 1072	4672	amongys.exe	92
PID 4672 wrote to memory of 1072	4672	amongys.exe	92
PID 4672 wrote to memory of 1072	4672	amongys.exe	92
PID 4672 wrote to memory of 1072	4672	amongys.exe	92
PID 4672 wrote to memory of 1072	4672	amongys.exe	92
PID 1072 wrote to memory of 3400	1072	RegAsm.exe	94
PID 1072 wrote to memory of 3400	1072	RegAsm.exe	94
PID 1072 wrote to memory of 3400	1072	RegAsm.exe	94

C:\Users\Admin\AppData\Local\Temp\amongys.exe
"C:\Users\Admin\AppData\Local\Temp\amongys.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4672
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:2608
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:4388
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:1976
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1072
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    PID:3400

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

Query Registry

1

T1012

System Information Discovery

2

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\Temp\__PSScriptPolicyTest_2hw5zjhv.zim.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1072-11-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1072-17-0x00000000750C0000-0x0000000075871000-memory.dmp

Filesize
7.7MB

Download
memory/1072-16-0x0000000004FF0000-0x0000000005056000-memory.dmp

Filesize
408KB

Download
memory/1072-15-0x0000000004F50000-0x0000000004FEC000-memory.dmp

Filesize
624KB

Download
memory/1072-14-0x00000000750C0000-0x0000000075871000-memory.dmp

Filesize
7.7MB

Download
memory/3400-22-0x00000000750C0000-0x0000000075871000-memory.dmp

Filesize
7.7MB

Download
memory/3400-28-0x00000000053B0000-0x00000000053D2000-memory.dmp

Filesize
136KB

Download
memory/3400-36-0x0000000006270000-0x00000000062BC000-memory.dmp

Filesize
304KB

Download
memory/3400-35-0x00000000061C0000-0x00000000061DE000-memory.dmp

Filesize
120KB

Download
memory/3400-34-0x0000000005DA0000-0x00000000060F7000-memory.dmp

Filesize
3.3MB

Download
memory/3400-33-0x0000000005C50000-0x0000000005CB6000-memory.dmp

Filesize
408KB

Download
memory/3400-21-0x00000000750C0000-0x0000000075871000-memory.dmp

Filesize
7.7MB

Download
memory/3400-20-0x0000000005410000-0x0000000005ADA000-memory.dmp

Filesize
6.8MB

Download
memory/3400-19-0x00000000750C0000-0x0000000075871000-memory.dmp

Filesize
7.7MB

Download
memory/3400-18-0x0000000004B80000-0x0000000004BB6000-memory.dmp

Filesize
216KB

Download
memory/4672-2-0x0000000005A60000-0x0000000006006000-memory.dmp

Filesize
5.6MB

Download
memory/4672-3-0x00000000053E0000-0x0000000005472000-memory.dmp

Filesize
584KB

Download
memory/4672-4-0x00000000750C0000-0x0000000075871000-memory.dmp

Filesize
7.7MB

Download
memory/4672-5-0x00000000054C0000-0x00000000054CA000-memory.dmp

Filesize
40KB

Download
memory/4672-13-0x00000000750C0000-0x0000000075871000-memory.dmp

Filesize
7.7MB

Download
memory/4672-0-0x00000000750CE000-0x00000000750CF000-memory.dmp

Filesize
4KB

Download
memory/4672-7-0x00000000750CE000-0x00000000750CF000-memory.dmp

Filesize
4KB

Download
memory/4672-1-0x0000000000B40000-0x0000000000B5A000-memory.dmp

Filesize
104KB

Download
memory/4672-6-0x0000000005580000-0x00000000055F6000-memory.dmp

Filesize
472KB

Download
memory/4672-10-0x0000000005770000-0x000000000578E000-memory.dmp

Filesize
120KB

Download
memory/4672-9-0x0000000005540000-0x0000000005558000-memory.dmp

Filesize
96KB

Download
memory/4672-8-0x00000000750C0000-0x0000000075871000-memory.dmp

Filesize
7.7MB

Download

Analysis

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