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Analysis
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max time kernel
9s -
max time network
40s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
25/12/2024, 13:40 UTC
General
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Target
testing.exe
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Size
1.3MB
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MD5
af7a3708906e1ba0d51e43ce64e72b95
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SHA1
266af0471cdb6c1e7f682da899c4539abc52e46a
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SHA256
5277b6dfc55feb2002a93bc92a535360e29b738fb333db5f19be94d1c18b3e52
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SHA512
989fe2856a3c21d91b70bc2f207b34d05af22d35aaaec2315d991839939c916bd83e4f5849ec289b9b68799ac96b2b041354758c1af967a3717bcdcfe1994892
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SSDEEP
24576:cImw98okVgela0as5CqLVO7XJCjkD3N0HRAWRiDBN:qL5ljasaU2DBN
Malware Config
Signatures
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Avoslocker Ransomware
Avoslocker is a relatively new ransomware, that was observed in late June and early July, 2021.
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Avoslocker family
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Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
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Renames multiple (5057) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE 1 IoCs
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Enumerates connected drives 3 TTPs 1 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
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Drops file in Program Files directory 64 IoCs
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Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs
Using powershell.exe command.
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
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Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
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Opens file in notepad (likely ransom note) 1 IoCs
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Suspicious behavior: EnumeratesProcesses 5 IoCs
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Suspicious use of AdjustPrivilegeToken 60 IoCs
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Suspicious use of WriteProcessMemory 23 IoCs
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Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
Processes
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C:\Users\Admin\AppData\Local\Temp\testing.exe"C:\Users\Admin\AppData\Local\Temp\testing.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\temp_executable.exe"C:\Users\Admin\AppData\Local\Temp\temp_executable.exe"2⤵
- Executes dropped EXE
- Enumerates connected drives
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\cmd.execmd /c wmic shadowcopy delete /nointeractive3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete /nointeractive4⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SYSTEM32\cmd.execmd /c vssadmin.exe Delete Shadows /All /Quiet3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet4⤵
- Interacts with shadow copies
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C:\Windows\SYSTEM32\cmd.execmd /c bcdedit /set {default} recoveryenabled No3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled No4⤵
- Modifies boot configuration data using bcdedit
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C:\Windows\SYSTEM32\cmd.execmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
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C:\Windows\SYSTEM32\cmd.execmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exepowershell -Command "$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;"3⤵
- Command and Scripting Interpreter: PowerShell
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C:\Windows\system32\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\928186502.png /f4⤵
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C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False4⤵
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\GET_YOUR_FILES_BACK.txt1⤵
- Opens file in notepad (likely ransom note)
Network
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DNS8.8.8.8.in-addr.arpaRemote address:8.8.8.8:53Request8.8.8.8.in-addr.arpaIN PTRResponse8.8.8.8.in-addr.arpaIN PTRdnsgoogle -
DNS97.17.167.52.in-addr.arpaRemote address:8.8.8.8:53Request97.17.167.52.in-addr.arpaIN PTRResponse
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DNS181.129.81.91.in-addr.arpaRemote address:8.8.8.8:53Request181.129.81.91.in-addr.arpaIN PTRResponse
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DNS140.32.126.40.in-addr.arpaRemote address:8.8.8.8:53Request140.32.126.40.in-addr.arpaIN PTRResponse
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DNS95.221.229.192.in-addr.arpaRemote address:8.8.8.8:53Request95.221.229.192.in-addr.arpaIN PTRResponse
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DNS217.106.137.52.in-addr.arpaRemote address:8.8.8.8:53Request217.106.137.52.in-addr.arpaIN PTRResponse
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DNS50.23.12.20.in-addr.arpaRemote address:8.8.8.8:53Request50.23.12.20.in-addr.arpaIN PTRResponse
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DNS241.42.69.40.in-addr.arpaRemote address:8.8.8.8:53Request241.42.69.40.in-addr.arpaIN PTRResponse
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DNS172.210.232.199.in-addr.arpaRemote address:8.8.8.8:53Request172.210.232.199.in-addr.arpaIN PTRResponse
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8.8.8.8:538.8.8.8.in-addr.arpadns
DNS Request
8.8.8.8.in-addr.arpa
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8.8.8.8:5397.17.167.52.in-addr.arpadns
DNS Request
97.17.167.52.in-addr.arpa
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8.8.8.8:53181.129.81.91.in-addr.arpadns
DNS Request
181.129.81.91.in-addr.arpa
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8.8.8.8:53140.32.126.40.in-addr.arpadns
DNS Request
140.32.126.40.in-addr.arpa
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8.8.8.8:5395.221.229.192.in-addr.arpadns
DNS Request
95.221.229.192.in-addr.arpa
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8.8.8.8:53217.106.137.52.in-addr.arpadns
DNS Request
217.106.137.52.in-addr.arpa
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8.8.8.8:5350.23.12.20.in-addr.arpadns
DNS Request
50.23.12.20.in-addr.arpa
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8.8.8.8:53241.42.69.40.in-addr.arpadns
DNS Request
241.42.69.40.in-addr.arpa
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8.8.8.8:53172.210.232.199.in-addr.arpadns
DNS Request
172.210.232.199.in-addr.arpa
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
2KB
MD56cf293cb4d80be23433eecf74ddb5503
SHA124fe4752df102c2ef492954d6b046cb5512ad408
SHA256b1f292b6199aa29c7fafbca007e5f9e3f68edcbbca1965bc828cc92dc0f18bb8
SHA5120f91e2da0da8794b9797c7b50eb5dfd27bde4546ceb6902a776664ce887dd6f12a0dd8773d612ccc76dfd029cd280778a0f0ae17ce679b3d2ffd968dd7e94a00
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Filesize
1KB
MD5c8861299853606fac3016094fcb76d2e
SHA18969dfdc86ceceb91bec0956f6a672a8606bc841
SHA25607b966f55b6c7b2f633c7a4ace5c3cc0fc6f6dcbea8ff0da2210ed4a34c2cdf0
SHA512841ca021eb2e9cb9831c2637f97739b0f2b35919b4e7eea3e39af808564f06b1d2175d618912603d1f61b364882c626799f68e069b13224d5db920ac7a267ef3
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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Filesize
807KB
MD5e27b5291c8fb2dfdeb7f16bb6851df5e
SHA140207f83b601cd60905c1f807ac0889c80dfe33f
SHA256ffd933ad53f22a0f10cceb4986087258f72dffdd36999b7014c6b37c157ee45f
SHA5122ddbc50cd780ffbf73c354b9b437322eb49cb05bb6f287d54e7dcafb61dc4c4549e37ae2f972f3d240bfa7d2ca485b7583137f1bf038bc901f378cea0c305c6a
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Filesize
1011B
MD5c92c2b70fb37f84aab38412ad9226aa8
SHA114f2e9a83285612d0a7b2c83b8f89bccfde6c154
SHA256d64639e873c0873b469cd856d1ef4bce7dc14a80fac6fe2bed9d629f05acc77f
SHA51204f9dcb3cd49909712535255b6eadd7fafcb2902bf1abd5a25e9bb5f5c4dc032611aec0a5b0ec89cd7dbc65276b935c54b906b391507d2e3e3aa65466b15f848
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Filesize
1.3MB
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Filesize
136KB
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Filesize
2.1MB
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Filesize
2.1MB
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Filesize
2.1MB