Analysis
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max time kernel
760s -
max time network
764s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
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submitted
08-04-2024 21:56
Errors
General
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Target
Flash Player.exe
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Size
534KB
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MD5
670c5e520902ccad978f4171dab178f4
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SHA1
09d08afadf92f6d7303ed406f7da32ddd708090a
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SHA256
d9f889aecab50e4037018337cbbe4cc3c3b0f3647dc3e97de909d3aaa0c47097
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SHA512
ec01f7aae8a909435823309748179408fe8b09288c4f8ba936a1c2b24ba8c2ee81dc5b9903c8401995855ba320daf79c9f755509560ded9cc697eb777f150931
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SSDEEP
12288:rdJX8v+mtT+AAAAAAAAAAAAAAAXAbAAAAAAAAAAAAAAAAAAAAAbAAAgAxAAAAAAk:rXHmtT
Malware Config
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 2 IoCs
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Deletes shadow copies 2 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 (191) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Deletes backup catalog 3 TTPs 1 IoCs
Uses wbadmin.exe to inhibit system recovery.
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Checks computer location settings 2 TTPs 4 IoCs
Looks up country code configured in the registry, likely geofence.
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Drops startup file 6 IoCs
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Executes dropped EXE 15 IoCs
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Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Adds Run key to start application 2 TTPs 2 IoCs
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Drops desktop.ini file(s) 34 IoCs
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Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
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Sets desktop wallpaper using registry 2 TTPs 1 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Checks SCSI registry key(s) 3 TTPs 4 IoCs
SCSI information is often read in order to detect sandboxing environments.
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Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
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Modifies data under HKEY_USERS 15 IoCs
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Modifies registry class 1 IoCs
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Opens file in notepad (likely ransom note) 1 IoCs
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Suspicious behavior: AddClipboardFormatListener 1 IoCs
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Suspicious behavior: EnumeratesProcesses 43 IoCs
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Suspicious use of AdjustPrivilegeToken 64 IoCs
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Suspicious use of WriteProcessMemory 41 IoCs
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Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
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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\Flash Player.exe"C:\Users\Admin\AppData\Local\Temp\Flash Player.exe"1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\cssrs.exe"C:\Users\Admin\AppData\Roaming\cssrs.exe"2⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Adds Run key to start application
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exeschtasks /delete /tn "NvidiaDreever" /f3⤵
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C:\Windows\SysWOW64\schtasks.exeschtasks /create /sc minute /mo 1 /tn "NvidiaDreever" /tr C:\Users\Admin\AppData\Roaming\cssrs.exe3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Temp\fb7bf1bcb6554347a2a61cfd3aea60dc.exe"C:\Users\Admin\AppData\Local\Temp\fb7bf1bcb6554347a2a61cfd3aea60dc.exe"3⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\XXX555.exe"C:\Users\Admin\AppData\Roaming\XXX555.exe"4⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete5⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet6⤵
- Interacts with shadow copies
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete6⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no5⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures6⤵
- Modifies boot configuration data using bcdedit
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no6⤵
- Modifies boot configuration data using bcdedit
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet5⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet6⤵
- Deletes backup catalog
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C:\Windows\SysWOW64\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\be7006e805c3438f85647f0d169df9e6.txt3⤵
- Opens file in notepad (likely ransom note)
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C:\Windows\SysWOW64\shutdown.exe"C:\Windows\System32\shutdown.exe" /s /t 003⤵
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /C choice /C Y /N /D Y /T 5 & Del "C:\Users\Admin\AppData\Local\Temp\Flash Player.exe"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\choice.exechoice /C Y /N /D Y /T 53⤵
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Roaming\cssrs.exeC:\Users\Admin\AppData\Roaming\cssrs.exe1⤵
- Executes dropped EXE
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C:\Windows\system32\LogonUI.exe"LogonUI.exe" /flags:0x4 /state0:0xa3956855 /state1:0x41c64e6d1⤵
- Modifies data under HKEY_USERS
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
617B
MD585306571e7ae6002dd2a0fb3042b7472
SHA1c897ab7434b118a8ec1fe25205903f5ec8f71241
SHA25640c98b01052cd95102701b71b4fbe0eda48537435898c413239f5f888a614253
SHA5120e9853dab46fd5f6f9eea44377d3802e9cc2fff7ba2f9b45c7c8fc37b860ad9c3c4beb6e1572c87964e06144504210e29038cb03e00c7e7af6ad32e6e995c76a
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Filesize
59B
MD5403bb7ecdfbb13b27a7b7ae2e6b8014f
SHA18277f0e4ae5648dc81e824e8a7ee36f80adbdbef
SHA25608819d4f60facc62ae8564157cc34163eb7e5ad4c4732109c9d4a7d20e76f783
SHA512b4b14e33bc11c99c839ef8f963c972f62fe63ec9af0300e3aeaf1868c95f71e66355e437dd4902f5d9904dc54beb94e4aec6c214e3c88ce0d81eb761e283393e
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Filesize
1.2MB
MD5e4ea9a5aee8f1d7576d8237b52fe345c
SHA1abf5a63f22b6d953a3cf8304f52cd2ceb1701055
SHA256d2d89b20e8f6fed21b4d8747df80d8c43107853e9d820cb9d5aeb832a36d773b
SHA512761f1ca9ea9dd5c2c0930d3681467924a1d4ab9cd64d02ddbe2d8555a021e96f9f8b260c3a80ea96d18115999f2289686b4644ee240864a0d3000620facf90e8
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Filesize
534KB
MD5670c5e520902ccad978f4171dab178f4
SHA109d08afadf92f6d7303ed406f7da32ddd708090a
SHA256d9f889aecab50e4037018337cbbe4cc3c3b0f3647dc3e97de909d3aaa0c47097
SHA512ec01f7aae8a909435823309748179408fe8b09288c4f8ba936a1c2b24ba8c2ee81dc5b9903c8401995855ba320daf79c9f755509560ded9cc697eb777f150931
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Filesize
171B
MD53e6c4d018bb590573ad262cc1715d7b9
SHA1d1b9156f9c88feb4d8da5d6b18d7861622794960
SHA25606442ae852bdef53ce2a12888f2204f0b2facd1fb43cbba94869adc97e6ad00a
SHA5124bba042c7c071d1f63ac51c1e2c4ff440c5bf00f1836668cc7048f35332da9a7324b41394596c0da9fb77c8a6ececc722f955185dd0f983c2c236ea19bfb0b19
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Filesize
64KB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
64KB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
-
Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
40KB
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Filesize
7.7MB
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Filesize
40KB
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Filesize
7.7MB
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Filesize
584KB
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Filesize
408KB
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Filesize
96KB
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Filesize
7.7MB
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Filesize
64KB
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Filesize
64KB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
560KB
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Filesize
7.7MB
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Filesize
5.6MB
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Filesize
624KB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
1.2MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB
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Filesize
7.7MB