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Analysis
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max time kernel
35s -
max time network
36s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
17/01/2025, 07:53
Behavioral task
behavioral1
Sample
ransomware no builder.exe
Resource
win7-20241010-en
Behavioral task
behavioral2
Sample
ransomware no builder.exe
Resource
win10v2004-20241007-en
General
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Target
ransomware no builder.exe
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Size
1.4MB
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MD5
a5a4a257e1653c4698654bc42afc69bb
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SHA1
8fedb0e6a95209d7359ca87c22ba69d67d3beef6
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SHA256
9c13e10e2245bd99a0f896e0cb1f957dbee2a29c08a80c6bf5f9c51a366b9755
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SHA512
c9f639823620087979a0d972cba63b93f183789972129015e154ad2ff89918bd511b0534f2d3e7cb5b089d44fcc191dfed6834647e0455ad0958845dd8b8d80b
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SSDEEP
12288:cKf3eIVklJaw4dXgRXBz1EBp8Nv6vWoFJXjbvBUn3BxFIVcGA9MR/s1wDhA9yPwC:ARcWxPY/OyH
Malware Config
Extracted
C:\Users\Admin\Documents\decrypt.txt
chaos
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 2 IoCs
resource yara_rule behavioral2/memory/2372-1-0x0000000000450000-0x00000000005B6000-memory.dmp family_chaos behavioral2/files/0x000c000000023b74-6.dat family_chaos -
Chaos family
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Renames multiple (187) 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 2 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation ransomware no builder.exe Key value queried \REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation svchost.exe -
Drops startup file 3 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.url svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini svchost.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\decrypt.txt svchost.exe -
Executes dropped EXE 1 IoCs
pid Process 1376 svchost.exe -
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Drops desktop.ini file(s) 34 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-493223053-2004649691-1575712786-1000\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Saved Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Camera Roll\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\Admin\OneDrive\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\4qzx0h2az.jpg" svchost.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Modifies registry class 2 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings svchost.exe Key created \REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings OpenWith.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 4956 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 1376 svchost.exe -
Suspicious behavior: EnumeratesProcesses 51 IoCs
pid Process 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 2372 ransomware no builder.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe 1376 svchost.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
pid Process 1532 OpenWith.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2372 ransomware no builder.exe Token: SeDebugPrivilege 1376 svchost.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 4956 NOTEPAD.EXE -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 1532 OpenWith.exe -
Suspicious use of WriteProcessMemory 4 IoCs
description pid Process procid_target PID 2372 wrote to memory of 1376 2372 ransomware no builder.exe 85 PID 2372 wrote to memory of 1376 2372 ransomware no builder.exe 85 PID 1376 wrote to memory of 4956 1376 svchost.exe 87 PID 1376 wrote to memory of 4956 1376 svchost.exe 87
Processes
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C:\Users\Admin\AppData\Local\Temp\ransomware no builder.exe"C:\Users\Admin\AppData\Local\Temp\ransomware no builder.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2372 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"2⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1376 -
C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\decrypt.txt3⤵
- Opens file in notepad (likely ransom note)
- Suspicious use of FindShellTrayWindow
PID:4956
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C:\Windows\system32\OpenWith.exeC:\Windows\system32\OpenWith.exe -Embedding1⤵
- Modifies registry class
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
PID:1532
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
1.4MB
MD5a5a4a257e1653c4698654bc42afc69bb
SHA18fedb0e6a95209d7359ca87c22ba69d67d3beef6
SHA2569c13e10e2245bd99a0f896e0cb1f957dbee2a29c08a80c6bf5f9c51a366b9755
SHA512c9f639823620087979a0d972cba63b93f183789972129015e154ad2ff89918bd511b0534f2d3e7cb5b089d44fcc191dfed6834647e0455ad0958845dd8b8d80b
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Filesize
964B
MD54217b8b83ce3c3f70029a056546f8fd0
SHA1487cdb5733d073a0427418888e8f7070fe782a03
SHA2567d767e907be373c680d1f7884d779588eb643bebb3f27bf3b5ed4864aa4d8121
SHA5122a58c99fa52f99c276e27eb98aef2ce1205f16d1e37b7e87eb69e9ecda22b578195a43f1a7f70fead6ba70421abf2f85c917551c191536eaf1f3011d3d24f740