avoslocker | 09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35

General

Target

09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe
Size

1.1MB
MD5

7dd0ecddec8c2a13b97ebfcd0b7889cb
SHA1

ba26cdd8c21bac8e7b49b419290208c7e91b9df0
SHA256

09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35
SHA512

1e8097e66dccac8b198af4e000f54c1841d631220562aa94ae950977a34bb79dab89525cc4221c173265c03cbfcd49ebeaab43ee3520f6411fa26686e68e970d
SSDEEP

24576:g7xd22Xurl3uCiwv1CE7nNpdoQbMrLjVvCjkhR8U:4226xtNoQm3V6jM

Score

10^/10

avoslocker execution ransomware

Malware Config

Signatures

Avoslocker Ransomware
Avoslocker is a relatively new ransomware, that was observed in late June and early July, 2021.
ransomware avoslocker
Renames multiple (133) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\1451644574.png"	reg.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
5780	powershell.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
5780	powershell.exe
5780	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5780	powershell.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3604 wrote to memory of 5780	3604	09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe	83
PID 3604 wrote to memory of 5780	3604	09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe	83
PID 3604 wrote to memory of 5780	3604	09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe	83
PID 5780 wrote to memory of 5100	5780	powershell.exe	87
PID 5780 wrote to memory of 5100	5780	powershell.exe	87
PID 5780 wrote to memory of 5100	5780	powershell.exe	87
PID 5780 wrote to memory of 1472	5780	powershell.exe	90
PID 5780 wrote to memory of 1472	5780	powershell.exe	90
PID 5780 wrote to memory of 1472	5780	powershell.exe	90

C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe
"C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3604
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell -Command "$a = [System.IO.File]::ReadAllText(\"C:\GET_YOUR_FILES_BACK.txt\");Add-Type -AssemblyName System.Drawing;$filename = \"$env:temp\$(Get-Random).png\";$bmp = new-object System.Drawing.Bitmap 1920,1080;$font = new-object System.Drawing.Font Consolas,10;$brushBg = [System.Drawing.Brushes]::Black;$brushFg = [System.Drawing.Brushes]::White;$format = [System.Drawing.StringFormat]::GenericDefault;$format.Alignment = [System.Drawing.StringAlignment]::Center;$format.LineAlignment = [System.Drawing.StringAlignment]::Center;$graphics = [System.Drawing.Graphics]::FromImage($bmp);$graphics.FillRectangle($brushBg,0,0,$bmp.Width,$bmp.Height);$graphics.DrawString($a,$font,$brushFg,[System.Drawing.RectangleF]::FromLTRB(0, 0, 1920, 1080),$format);$graphics.Dispose();$bmp.Save($filename);reg add \"HKEY_CURRENT_USER\Control Panel\Desktop\" /v Wallpaper /t REG_SZ /d $filename /f;Start-Sleep 1;rundll32.exe user32.dll, UpdatePerUserSystemParameters, 0, $false;"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5780
- - C:\Windows\SysWOW64\reg.exe
    "C:\Windows\system32\reg.exe" add "HKEY_CURRENT_USER\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d C:\Users\Admin\AppData\Local\Temp\1451644574.png /f
    3⤵
    - Sets desktop wallpaper using registry
    PID:5100
- - C:\Windows\SysWOW64\rundll32.exe
    "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
    3⤵
    PID:1472

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

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

1

T1491

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_jik5dllp.2pa.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\GET_YOUR_FILES_BACK.txt

Filesize
1011B

MD5
56d4bd7f10cb90aad3515b1ad6f6a18e

SHA1
74c6f4a6e24982584f494ad704896585ae6b3df6

SHA256
d3ae28884579358a4a420d503ec0b53b2d208c1421fc74294480fa409e5d0fc9

SHA512
98b10c847f42c533d1ac24c8c05d7ab6d055bd608b5a52d032cbd0304cecab1f8f2e0bdaed7db7313f8de2f820f24a749debe13b512e25a91cb879e4b686848c

Download Submit
memory/3604-5-0x0000000000690000-0x0000000000692000-memory.dmp

Filesize
8KB

Download
memory/3604-7-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/3604-6-0x0000000000401000-0x00000000004B2000-memory.dmp

Filesize
708KB

Download
memory/3604-4-0x0000000002220000-0x0000000002265000-memory.dmp

Filesize
276KB

Download
memory/3604-8-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/3604-2-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/3604-1-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/3604-9-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/3604-3-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/3604-395-0x0000000000401000-0x00000000004B2000-memory.dmp

Filesize
708KB

Download
memory/3604-394-0x0000000002220000-0x0000000002265000-memory.dmp

Filesize
276KB

Download
memory/3604-393-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/3604-0-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/5780-396-0x000000007458E000-0x000000007458F000-memory.dmp

Filesize
4KB

Download
memory/5780-397-0x0000000005240000-0x0000000005276000-memory.dmp

Filesize
216KB

Download
memory/5780-399-0x0000000074580000-0x0000000074D30000-memory.dmp

Filesize
7.7MB

Download
memory/5780-400-0x0000000074580000-0x0000000074D30000-memory.dmp

Filesize
7.7MB

Download
memory/5780-401-0x0000000005850000-0x0000000005872000-memory.dmp

Filesize
136KB

Download
memory/5780-402-0x0000000006130000-0x0000000006196000-memory.dmp

Filesize
408KB

Download
memory/5780-403-0x0000000006210000-0x0000000006276000-memory.dmp

Filesize
408KB

Download
memory/5780-398-0x0000000005990000-0x0000000005FB8000-memory.dmp

Filesize
6.2MB

Download
memory/5780-413-0x0000000006420000-0x0000000006774000-memory.dmp

Filesize
3.3MB

Download
memory/5780-414-0x0000000006800000-0x000000000681E000-memory.dmp

Filesize
120KB

Download
memory/5780-415-0x0000000006840000-0x000000000688C000-memory.dmp

Filesize
304KB

Download
memory/5780-417-0x0000000007E40000-0x00000000084BA000-memory.dmp

Filesize
6.5MB

Download
memory/5780-418-0x0000000006D50000-0x0000000006D6A000-memory.dmp

Filesize
104KB

Download
memory/5780-419-0x0000000007BD0000-0x0000000007C62000-memory.dmp

Filesize
584KB

Download
memory/5780-420-0x0000000074580000-0x0000000074D30000-memory.dmp

Filesize
7.7MB

Download
memory/5780-424-0x0000000074580000-0x0000000074D30000-memory.dmp

Filesize
7.7MB

Download

Analysis

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