avoslocker | a1b504b8e34200d8029f6d75491d517e460162cb9df438257ee4ed85f61c18bc

General

Target

JaffaCakes118_f75e92b4cf12745c63966bb50c82e4be.exe
Size

921KB
MD5

f75e92b4cf12745c63966bb50c82e4be
SHA1

e58678781548262b653b34bbf3f55339d53f28cb
SHA256

a1b504b8e34200d8029f6d75491d517e460162cb9df438257ee4ed85f61c18bc
SHA512

2d66d1868e44956c00593d7d19d70b14475571dcd9b5eee9d15ac4fa3d473ce3a05c598c57ea31707b4deaa3469ed046b85f4e9c3f04430e652eda4d6a4f6038
SSDEEP

24576:SnkXEg1ZlhKG+WWZtCpDCE5Ie534SCeTpOl13lHlI:SkXEg1ZlIzZtCpGE5j5oSHOlxRlI

Score

10^/10

avoslocker discovery execution ransomware

Malware Config

Extracted

Path

F:\$RECYCLE.BIN\GET_YOUR_FILES_BACK.txt

Ransom Note

AvosLocker Attention! Your systems have been encrypted, and your confidential documents were downloaded. In order to restore your data, you must pay for the decryption key & application. You may do so by visiting us at http://avosjon4pfh3y7ew3jdwz6ofw7lljcxlbk7hcxxmnxlh5kvf2akcqjad.onion. This is an onion address that you may access using Tor Browser which you may download at https://www.torproject.org/download/ Details such as pricing, how long before the price increases and such will be available to you once you enter your ID presented to you below in this note in our website. Contact us soon, because those who don't have their data leaked in our press release blog and the price they'll have to pay will go up significantly. The corporations whom don't pay or fail to respond in a swift manner have their data leaked in our blog, accessible at http://avosqxh72b5ia23dl5fgwcpndkctuzqvh2iefk5imp3pi5gfhel5klad.onion Additional notes from attackers responsible: Hello, All your data in the company is encrypted and your important company data is backed up. I do not need money, I receive payments from many companies every day and I deal with the encryption of many companies every day. More important than money is time for me. For this reason, I have time to inflate the number and bargain like other friends who do this business. The offer I have made for your company is very reasonable and not a big deal for you. If you do not pay, the data of the company that we have backed up after 7 days will be shared publicly on the internet and you will not be able to recover any of your encrypted data. Your ID: 8c7a9b681dfa1b2b87ea459caddf2adf9413dc76664fb74063fb264116897023

URLs

http://avosjon4pfh3y7ew3jdwz6ofw7lljcxlbk7hcxxmnxlh5kvf2akcqjad.onion

http://avosqxh72b5ia23dl5fgwcpndkctuzqvh2iefk5imp3pi5gfhel5klad.onion

Signatures

Avoslocker Ransomware
Avoslocker is a relatively new ransomware, that was observed in late June and early July, 2021.
ransomware avoslocker
Avoslocker family
avoslocker
Renames multiple (168) 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-1-5-21-1163522206-1469769407-485553996-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\581324137.png"	reg.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1536	powershell.exe

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_f75e92b4cf12745c63966bb50c82e4be.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1536	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1536	powershell.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1556 wrote to memory of 1536	1556	JaffaCakes118_f75e92b4cf12745c63966bb50c82e4be.exe	31
PID 1556 wrote to memory of 1536	1556	JaffaCakes118_f75e92b4cf12745c63966bb50c82e4be.exe	31
PID 1556 wrote to memory of 1536	1556	JaffaCakes118_f75e92b4cf12745c63966bb50c82e4be.exe	31
PID 1556 wrote to memory of 1536	1556	JaffaCakes118_f75e92b4cf12745c63966bb50c82e4be.exe	31
PID 1536 wrote to memory of 544	1536	powershell.exe	34
PID 1536 wrote to memory of 544	1536	powershell.exe	34
PID 1536 wrote to memory of 544	1536	powershell.exe	34
PID 1536 wrote to memory of 544	1536	powershell.exe	34
PID 1536 wrote to memory of 1684	1536	powershell.exe	35
PID 1536 wrote to memory of 1684	1536	powershell.exe	35
PID 1536 wrote to memory of 1684	1536	powershell.exe	35
PID 1536 wrote to memory of 1684	1536	powershell.exe	35
PID 1536 wrote to memory of 1684	1536	powershell.exe	35
PID 1536 wrote to memory of 1684	1536	powershell.exe	35
PID 1536 wrote to memory of 1684	1536	powershell.exe	35

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f75e92b4cf12745c63966bb50c82e4be.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_f75e92b4cf12745c63966bb50c82e4be.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1556
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell -Command "$a = [System.IO.File]::ReadAllText(\"F:\GET_YOUR_FILES_BACK.txt\");Add-Type -AssemblyName System.Drawing;$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
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1536
- - 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\581324137.png /f
    3⤵
    - Sets desktop wallpaper using registry
    - System Location Discovery: System Language Discovery
    PID:544
- - C:\Windows\SysWOW64\rundll32.exe
    "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1684

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

1

T1491

Replay Monitor

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Downloads

F:\$RECYCLE.BIN\GET_YOUR_FILES_BACK.txt

Filesize
1KB

MD5
9cd17876488bd2c2b81b965620b9aa14

SHA1
f5305680ebd56c1eebc1797c6a7ce93117c3423c

SHA256
08152eb79c4f4b16badb06fe231da164570b62999357c8da8659e6d024f11127

SHA512
7eea1d69e706ef86c0d2343630bc3553b2d5418523d2e4aabcc66d1c0ea3754351ed4c0ab6c185eabbd313f5333d56182c0a9e873aa05b1c5e514e9a3dfceb8d

Download Submit
memory/1536-415-0x0000000073C41000-0x0000000073C42000-memory.dmp

Filesize
4KB

Download
memory/1536-416-0x0000000073C40000-0x00000000741EB000-memory.dmp

Filesize
5.7MB

Download
memory/1536-418-0x0000000073C40000-0x00000000741EB000-memory.dmp

Filesize
5.7MB

Download
memory/1536-417-0x0000000073C40000-0x00000000741EB000-memory.dmp

Filesize
5.7MB

Download
memory/1536-419-0x0000000073C40000-0x00000000741EB000-memory.dmp

Filesize
5.7MB

Download
memory/1536-422-0x0000000073C40000-0x00000000741EB000-memory.dmp

Filesize
5.7MB

Download

Analysis

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