xworm | 8641f88b89c9076ece3ee571baa4b3c93ba3ac3883e90fe5f894dc41e3b7bdc7

General

Target

Ro-exec/loader-upd.exe
Size

70KB
MD5

573bd20fc8382d92a7ae9eae51e738e3
SHA1

55006093429df791f27e91a66e5ee63a81382b28
SHA256

09036ffa342f9e5bb1e31a867dcc3b60db011baba8c0d202aff1d33195cbe729
SHA512

d38736acff4128d6ce9ea17ee609ca33a37ac88f2c994cf4caf7f0eb62406a8963c33531b9f3cd020974d892c2751f3a4f67ce13ed6ba6080f97c406ccbb4aca
SSDEEP

1536:PmMfwrNATngx6fPLgD9vYebv2S5NiwWW6N9dOoihkAO:LCmn463UD6ebv242FzOoiSAO

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%Public%
install_file
svchost.exe
pastebin_url
https://pastebin.com/raw/UWpQULMP

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral6/memory/1868-1-0x0000000000BF0000-0x0000000000C08000-memory.dmp	family_xworm
behavioral6/files/0x00080000000229cd-56.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
3196	powershell.exe
548	powershell.exe
216	powershell.exe
4628	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-1-5-21-877519540-908060166-1852957295-1000\Control Panel\International\Geo\Nation	loader-upd.exe

Executes dropped EXE 2 IoCs

pid	Process
3604	svchost.exe
2256	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-1-5-21-877519540-908060166-1852957295-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Public\\svchost.exe"	loader-upd.exe

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

Web Service

T1102

flow	ioc
25	pastebin.com
26	pastebin.com

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
3500	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1436	timeout.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1868	loader-upd.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3196	powershell.exe
3196	powershell.exe
548	powershell.exe
548	powershell.exe
216	powershell.exe
216	powershell.exe
4628	powershell.exe
4628	powershell.exe
1868	loader-upd.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	1868	loader-upd.exe
Token: SeDebugPrivilege	3196	powershell.exe
Token: SeDebugPrivilege	548	powershell.exe
Token: SeDebugPrivilege	216	powershell.exe
Token: SeDebugPrivilege	4628	powershell.exe
Token: SeDebugPrivilege	1868	loader-upd.exe
Token: SeDebugPrivilege	3604	svchost.exe
Token: SeDebugPrivilege	2256	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1868	loader-upd.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 1868 wrote to memory of 3196	1868	loader-upd.exe	92
PID 1868 wrote to memory of 3196	1868	loader-upd.exe	92
PID 1868 wrote to memory of 548	1868	loader-upd.exe	94
PID 1868 wrote to memory of 548	1868	loader-upd.exe	94
PID 1868 wrote to memory of 216	1868	loader-upd.exe	97
PID 1868 wrote to memory of 216	1868	loader-upd.exe	97
PID 1868 wrote to memory of 4628	1868	loader-upd.exe	100
PID 1868 wrote to memory of 4628	1868	loader-upd.exe	100
PID 1868 wrote to memory of 3500	1868	loader-upd.exe	105
PID 1868 wrote to memory of 3500	1868	loader-upd.exe	105
PID 1868 wrote to memory of 5068	1868	loader-upd.exe	126
PID 1868 wrote to memory of 5068	1868	loader-upd.exe	126
PID 1868 wrote to memory of 3476	1868	loader-upd.exe	127
PID 1868 wrote to memory of 3476	1868	loader-upd.exe	127
PID 3476 wrote to memory of 1436	3476	cmd.exe	130
PID 3476 wrote to memory of 1436	3476	cmd.exe	130

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\Ro-exec\loader-upd.exe
"C:\Users\Admin\AppData\Local\Temp\Ro-exec\loader-upd.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1868
- 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\Ro-exec\loader-upd.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3196
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'loader-upd.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:548
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:216
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4628
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchost" /tr "C:\Users\Public\svchost.exe"
  2⤵
  - Creates scheduled task(s)
  PID:3500
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /delete /f /tn "svchost"
  2⤵
  PID:5068
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpFD76.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3476
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1436

C:\Users\Public\svchost.exe
C:\Users\Public\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3604

C:\Users\Public\svchost.exe
C:\Users\Public\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2256

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

Scheduled Task/Job

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

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\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
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\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
a2c8179aaa149c0b9791b73ce44c04d1

SHA1
703361b0d43ec7f669304e7c0ffbbfdeb1e484ff

SHA256
c1d30342a40a2b6e7553da30ceb85754d33820f6fbb3bbbed1ceb30d6390de4a

SHA512
2e201dd457d055baad86f68c15bcc7beb48d6dc2ffc10db7f304eb93f697e7b45991cbde857d25da2c9c60c23f3e13df8b5ed5809c1753737a23096e296cc9e3

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

Filesize
944B

MD5
8e36164c76778c19637405adc15c138d

SHA1
5a84b55368cc3c58c628aef578b658fede2a27f4

SHA256
bc9323059bc4e6793598b39d942be6720745037ded472e084f2b2b4b60d07f87

SHA512
d2dade91b8654b52857af12addc756817910463d5cd366fe9a13d6b23c3f2024ee2603b094bc03815b5f0f28891142d914aa65950e8a073961a4a5a312c25ff4

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_fpbdnabh.iga.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpFD76.tmp.bat

Filesize
170B

MD5
1fdd41a71b3fe547c06f5baa66482834

SHA1
3d2139dec64d5e37aa6d39aa263549a08efe4749

SHA256
3f08913f0b48fe37a88b37083d3ec0826627d32f9ccf55858783f9aec196644f

SHA512
50da63f38c9cfc27c084c4f95a6417136e4d56e2956342f3ad083c2570326591d6739ec42137bc82ea50e5318de73563a4a61a3a94c83355a8856743f081f19b

Download Submit
C:\Users\Public\svchost.exe

Filesize
70KB

MD5
573bd20fc8382d92a7ae9eae51e738e3

SHA1
55006093429df791f27e91a66e5ee63a81382b28

SHA256
09036ffa342f9e5bb1e31a867dcc3b60db011baba8c0d202aff1d33195cbe729

SHA512
d38736acff4128d6ce9ea17ee609ca33a37ac88f2c994cf4caf7f0eb62406a8963c33531b9f3cd020974d892c2751f3a4f67ce13ed6ba6080f97c406ccbb4aca

Download Submit
memory/1868-53-0x00007FF97DB40000-0x00007FF97E601000-memory.dmp

Filesize
10.8MB

Download
memory/1868-54-0x00007FF97DB43000-0x00007FF97DB45000-memory.dmp

Filesize
8KB

Download
memory/1868-55-0x00007FF97DB40000-0x00007FF97E601000-memory.dmp

Filesize
10.8MB

Download
memory/1868-0-0x00007FF97DB43000-0x00007FF97DB45000-memory.dmp

Filesize
8KB

Download
memory/1868-61-0x000000001B810000-0x000000001B81C000-memory.dmp

Filesize
48KB

Download
memory/1868-65-0x00007FF97DB40000-0x00007FF97E601000-memory.dmp

Filesize
10.8MB

Download
memory/1868-1-0x0000000000BF0000-0x0000000000C08000-memory.dmp

Filesize
96KB

Download
memory/3196-17-0x00007FF97DB40000-0x00007FF97E601000-memory.dmp

Filesize
10.8MB

Download
memory/3196-14-0x00007FF97DB40000-0x00007FF97E601000-memory.dmp

Filesize
10.8MB

Download
memory/3196-13-0x00007FF97DB40000-0x00007FF97E601000-memory.dmp

Filesize
10.8MB

Download
memory/3196-12-0x00007FF97DB40000-0x00007FF97E601000-memory.dmp

Filesize
10.8MB

Download
memory/3196-2-0x00000158F0E60000-0x00000158F0E82000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads