xworm | 83fed663e88ac371eda1110b4cfc6e9b570ca54c8ed8af5c708850acf60da367

General

Target

WaveInstaller.exe
Size

77KB
MD5

9647906e913c1e597a15e45aa891fe85
SHA1

6b5572d68ef1e7fea13532b1802cd7c478afd8f2
SHA256

83fed663e88ac371eda1110b4cfc6e9b570ca54c8ed8af5c708850acf60da367
SHA512

7580b8ec10aaeb9df18026d5c09ba26f914f6dfa90d53dcc57d3e31695047e22263b67e152156ad2fa87ee3e63d8849ec778eff290ddd42f53be35fea17b2f6d
SSDEEP

1536:1yRPyrSigpeazyVTj+bbmZwIlHlZI67pSOAiynu7gPm4+:JrS5zI+bbWwkkOAiyucPx+

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

127.0.0.1:7000

174.117.48.242:7000

Attributes

Install_directory
%AppData%
install_file
RegAsm.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/4332-1-0x0000000000B50000-0x0000000000B6A000-memory.dmp	family_xworm
behavioral2/files/0x000c00000002349f-60.dat	family_xworm

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

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

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

execution

PowerShell

T1059.001

pid	Process
404	powershell.exe
3312	powershell.exe
2752	powershell.exe
2516	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-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation	WaveInstaller.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
1552	RegAsm.exe
3508	RegAsm.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-1-5-21-464762018-485119342-1613148473-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RegAsm = "C:\\Users\\Admin\\AppData\\Roaming\\RegAsm.exe"	WaveInstaller.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
2184	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3312	powershell.exe
3312	powershell.exe
2752	powershell.exe
2752	powershell.exe
2516	powershell.exe
2516	powershell.exe
404	powershell.exe
404	powershell.exe
4332	WaveInstaller.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	4332	WaveInstaller.exe
Token: SeDebugPrivilege	3312	powershell.exe
Token: SeDebugPrivilege	2752	powershell.exe
Token: SeDebugPrivilege	2516	powershell.exe
Token: SeDebugPrivilege	404	powershell.exe
Token: SeDebugPrivilege	4332	WaveInstaller.exe
Token: SeDebugPrivilege	1552	RegAsm.exe
Token: SeDebugPrivilege	3508	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4332	WaveInstaller.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4332 wrote to memory of 3312	4332	WaveInstaller.exe	91
PID 4332 wrote to memory of 3312	4332	WaveInstaller.exe	91
PID 4332 wrote to memory of 2752	4332	WaveInstaller.exe	93
PID 4332 wrote to memory of 2752	4332	WaveInstaller.exe	93
PID 4332 wrote to memory of 2516	4332	WaveInstaller.exe	96
PID 4332 wrote to memory of 2516	4332	WaveInstaller.exe	96
PID 4332 wrote to memory of 404	4332	WaveInstaller.exe	98
PID 4332 wrote to memory of 404	4332	WaveInstaller.exe	98
PID 4332 wrote to memory of 2184	4332	WaveInstaller.exe	100
PID 4332 wrote to memory of 2184	4332	WaveInstaller.exe	100

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\WaveInstaller.exe
"C:\Users\Admin\AppData\Local\Temp\WaveInstaller.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4332
- 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\WaveInstaller.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3312
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'WaveInstaller.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2752
- 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\RegAsm.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2516
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RegAsm.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:404
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "RegAsm" /tr "C:\Users\Admin\AppData\Roaming\RegAsm.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2184

C:\Users\Admin\AppData\Roaming\RegAsm.exe
C:\Users\Admin\AppData\Roaming\RegAsm.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1552

C:\Users\Admin\AppData\Roaming\RegAsm.exe
C:\Users\Admin\AppData\Roaming\RegAsm.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3508

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

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\Microsoft\CLR_v4.0\UsageLogs\RegAsm.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
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
d28a889fd956d5cb3accfbaf1143eb6f

SHA1
157ba54b365341f8ff06707d996b3635da8446f7

SHA256
21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

SHA512
0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

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

Filesize
944B

MD5
e3161f4edbc9b963debe22e29658050b

SHA1
45dbf88dadafe5dd1cfee1e987c8a219d3208cdb

SHA256
1359d6daeaed2f254b162914203c891b23139cc236a3bf75c2dfcbe26265c84a

SHA512
006ffb8f37d1f77f8ee79b22ffa413819f565d62773c632b70985759572121c6ab4743139d16d885f8c0ff9d0e0b136686741728b3e142ee54aea3bb733dffb2

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

Filesize
944B

MD5
d3e8199b4634731cf0a0c26c1f14f588

SHA1
7f8fae27eb80055a436a6b5457978f32673d9ad4

SHA256
ef33f487f93c2977e92fb08d6bdcc9d48b5d1864c402f9d3fbf3e1b30e8b3b9a

SHA512
806a123100dbc1ca1b27bbad5b93c3a9a840dc795127af8523333a71259a8c5ef8aefccb83ef390f2644e013f138c4b7b63c584acccb197aada0c70c038032e2

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_53ommshg.ncr.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
77KB

MD5
9647906e913c1e597a15e45aa891fe85

SHA1
6b5572d68ef1e7fea13532b1802cd7c478afd8f2

SHA256
83fed663e88ac371eda1110b4cfc6e9b570ca54c8ed8af5c708850acf60da367

SHA512
7580b8ec10aaeb9df18026d5c09ba26f914f6dfa90d53dcc57d3e31695047e22263b67e152156ad2fa87ee3e63d8849ec778eff290ddd42f53be35fea17b2f6d

Download Submit
memory/3312-12-0x00007FF807C80000-0x00007FF808741000-memory.dmp

Filesize
10.8MB

Download
memory/3312-17-0x00007FF807C80000-0x00007FF808741000-memory.dmp

Filesize
10.8MB

Download
memory/3312-14-0x00007FF807C80000-0x00007FF808741000-memory.dmp

Filesize
10.8MB

Download
memory/3312-13-0x00007FF807C80000-0x00007FF808741000-memory.dmp

Filesize
10.8MB

Download
memory/3312-2-0x00000186BCDF0000-0x00000186BCE12000-memory.dmp

Filesize
136KB

Download
memory/4332-0-0x00007FF807C83000-0x00007FF807C85000-memory.dmp

Filesize
8KB

Download
memory/4332-56-0x00007FF807C80000-0x00007FF808741000-memory.dmp

Filesize
10.8MB

Download
memory/4332-57-0x00007FF807C83000-0x00007FF807C85000-memory.dmp

Filesize
8KB

Download
memory/4332-58-0x00007FF807C80000-0x00007FF808741000-memory.dmp

Filesize
10.8MB

Download
memory/4332-1-0x0000000000B50000-0x0000000000B6A000-memory.dmp

Filesize
104KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads