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 (175) 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-1-5-21-3627615824-4061627003-3019543961-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\1377625139.png"	reg.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1892	powershell.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1892	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1892	powershell.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2820 wrote to memory of 1892	2820	09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe	29
PID 2820 wrote to memory of 1892	2820	09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe	29
PID 2820 wrote to memory of 1892	2820	09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe	29
PID 2820 wrote to memory of 1892	2820	09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe	29
PID 1892 wrote to memory of 2268	1892	powershell.exe	31
PID 1892 wrote to memory of 2268	1892	powershell.exe	31
PID 1892 wrote to memory of 2268	1892	powershell.exe	31
PID 1892 wrote to memory of 2268	1892	powershell.exe	31
PID 1892 wrote to memory of 992	1892	powershell.exe	32
PID 1892 wrote to memory of 992	1892	powershell.exe	32
PID 1892 wrote to memory of 992	1892	powershell.exe	32
PID 1892 wrote to memory of 992	1892	powershell.exe	32
PID 1892 wrote to memory of 992	1892	powershell.exe	32
PID 1892 wrote to memory of 992	1892	powershell.exe	32
PID 1892 wrote to memory of 992	1892	powershell.exe	32

C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe
"C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2820
- 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:1892
- - 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\1377625139.png /f
    3⤵
    - Sets desktop wallpaper using registry
    PID:2268
- - C:\Windows\SysWOW64\rundll32.exe
    "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
    3⤵
    PID:992

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:\GET_YOUR_FILES_BACK.txt

Filesize
1011B

MD5
56d4bd7f10cb90aad3515b1ad6f6a18e

SHA1
74c6f4a6e24982584f494ad704896585ae6b3df6

SHA256
d3ae28884579358a4a420d503ec0b53b2d208c1421fc74294480fa409e5d0fc9

SHA512
98b10c847f42c533d1ac24c8c05d7ab6d055bd608b5a52d032cbd0304cecab1f8f2e0bdaed7db7313f8de2f820f24a749debe13b512e25a91cb879e4b686848c

Download Submit
memory/1892-445-0x0000000074680000-0x0000000074C2B000-memory.dmp

Filesize
5.7MB

Download
memory/1892-444-0x0000000074681000-0x0000000074682000-memory.dmp

Filesize
4KB

Download
memory/1892-448-0x0000000074680000-0x0000000074C2B000-memory.dmp

Filesize
5.7MB

Download
memory/1892-447-0x0000000074680000-0x0000000074C2B000-memory.dmp

Filesize
5.7MB

Download
memory/1892-446-0x0000000074680000-0x0000000074C2B000-memory.dmp

Filesize
5.7MB

Download
memory/1892-451-0x0000000074680000-0x0000000074C2B000-memory.dmp

Filesize
5.7MB

Download
memory/2820-439-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/2820-8-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/2820-6-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/2820-3-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/2820-441-0x0000000000401000-0x00000000004B2000-memory.dmp

Filesize
708KB

Download
memory/2820-7-0x0000000000240000-0x0000000000242000-memory.dmp

Filesize
8KB

Download
memory/2820-440-0x0000000000270000-0x00000000002B5000-memory.dmp

Filesize
276KB

Download
memory/2820-4-0x0000000000270000-0x00000000002B5000-memory.dmp

Filesize
276KB

Download
memory/2820-0-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/2820-2-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/2820-5-0x0000000000401000-0x00000000004B2000-memory.dmp

Filesize
708KB

Download
memory/2820-9-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download
memory/2820-1-0x0000000000400000-0x00000000004FF000-memory.dmp

Filesize
1020KB

Download

Analysis

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