Analysis
-
max time kernel
256s -
max time network
141s -
platform
windows10_x64 -
resource
win10-en-20211208 -
submitted
11-01-2022 18:27
Static task
static1
Behavioral task
behavioral1
Sample
rook1.exe
Resource
win7-en-20211208
Behavioral task
behavioral2
Sample
rook1.exe
Resource
win10-en-20211208
Behavioral task
behavioral3
Sample
rook1.exe
Resource
macos
Behavioral task
behavioral4
Sample
rook1.exe
Resource
ubuntu1804-amd64-en-20211208
General
-
Target
rook1.exe
-
Size
5.4MB
-
MD5
4f7adc32ec67c1a55853ef828fe58707
-
SHA1
36de7997949ac3b9b456023fb072b9a8cd84ade8
-
SHA256
96f7df1c984c1753289600f7f373f3a98a4f09f82acc1be8ecfd5790763a355b
-
SHA512
a45e4a20133c842037789157c3ed845afdefbb0d2fe3958d75f0cb3cdfeee106262f9de0e0aca92ac84a0211432cd19773e0f769b970ddb8a80e5f7855676f74
Malware Config
Extracted
C:\PerfLogs\HowToRestoreYourFiles.txt
rook
Signatures
-
Rook
Rook is a ransomware which copies from NightSky ransomware.
-
Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
-
Executes dropped EXE 3 IoCs
Processes:
HxDSetup.tmpHxD.exeHxD.exepid process 2988 HxDSetup.tmp 2536 HxD.exe 3200 HxD.exe -
Modifies extensions of user files 10 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
rook1.exedescription ioc process File opened for modification C:\Users\Admin\Pictures\UnlockCompress.crw.Rook rook1.exe File opened for modification C:\Users\Admin\Pictures\CompareReset.tif.Rook rook1.exe File opened for modification C:\Users\Admin\Pictures\DenyRegister.crw.Rook rook1.exe File opened for modification C:\Users\Admin\Pictures\ExpandReceive.raw.Rook rook1.exe File renamed C:\Users\Admin\Pictures\ExpandInstall.png => C:\Users\Admin\Pictures\ExpandInstall.png.Rook rook1.exe File renamed C:\Users\Admin\Pictures\UnlockCompress.crw => C:\Users\Admin\Pictures\UnlockCompress.crw.Rook rook1.exe File renamed C:\Users\Admin\Pictures\CompareReset.tif => C:\Users\Admin\Pictures\CompareReset.tif.Rook rook1.exe File renamed C:\Users\Admin\Pictures\DenyRegister.crw => C:\Users\Admin\Pictures\DenyRegister.crw.Rook rook1.exe File renamed C:\Users\Admin\Pictures\ExpandReceive.raw => C:\Users\Admin\Pictures\ExpandReceive.raw.Rook rook1.exe File opened for modification C:\Users\Admin\Pictures\ExpandInstall.png.Rook rook1.exe -
Processes:
resource yara_rule behavioral2/memory/2424-115-0x00007FF7DCE80000-0x00007FF7DD79D000-memory.dmp vmprotect -
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
-
Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
Processes:
rook1.exedescription ioc process File opened (read-only) \??\J: rook1.exe File opened (read-only) \??\K: rook1.exe File opened (read-only) \??\V: rook1.exe File opened (read-only) \??\W: rook1.exe File opened (read-only) \??\R: rook1.exe File opened (read-only) \??\Y: rook1.exe File opened (read-only) \??\P: rook1.exe File opened (read-only) \??\G: rook1.exe File opened (read-only) \??\H: rook1.exe File opened (read-only) \??\N: rook1.exe File opened (read-only) \??\Q: rook1.exe File opened (read-only) \??\E: rook1.exe File opened (read-only) \??\U: rook1.exe File opened (read-only) \??\A: rook1.exe File opened (read-only) \??\S: rook1.exe File opened (read-only) \??\O: rook1.exe File opened (read-only) \??\L: rook1.exe File opened (read-only) \??\B: rook1.exe File opened (read-only) \??\M: rook1.exe File opened (read-only) \??\T: rook1.exe File opened (read-only) \??\I: rook1.exe File opened (read-only) \??\F: rook1.exe File opened (read-only) \??\Z: rook1.exe File opened (read-only) \??\X: rook1.exe -
Drops file in Program Files directory 8 IoCs
Processes:
HxDSetup.tmpdescription ioc process File created C:\Program Files\HxD\is-EV99A.tmp HxDSetup.tmp File opened for modification C:\Program Files\HxD\unins000.dat HxDSetup.tmp File opened for modification C:\Program Files\HxD\HxD.exe HxDSetup.tmp File created C:\Program Files\HxD\unins000.dat HxDSetup.tmp File created C:\Program Files\HxD\is-9B0S8.tmp HxDSetup.tmp File created C:\Program Files\HxD\is-UKROV.tmp HxDSetup.tmp File created C:\Program Files\HxD\is-90RVN.tmp HxDSetup.tmp File created C:\Program Files\HxD\is-125LP.tmp HxDSetup.tmp -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
-
Checks processor information in registry 2 TTPs 5 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
firefox.exedescription ioc process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 firefox.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Update Signature firefox.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Update Revision firefox.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~Mhz firefox.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier firefox.exe -
Interacts with shadow copies 2 TTPs 2 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
Processes:
vssadmin.exevssadmin.exepid process 352 vssadmin.exe 2972 vssadmin.exe -
Modifies registry class 2 IoCs
Processes:
firefox.exeHxDSetup.tmpdescription ioc process Key created \REGISTRY\USER\S-1-5-21-369956170-74428499-1628131376-1000_Classes\Local Settings firefox.exe Key created \REGISTRY\USER\S-1-5-21-369956170-74428499-1628131376-1000_Classes\Local Settings HxDSetup.tmp -
NTFS ADS 1 IoCs
Processes:
firefox.exedescription ioc process File created C:\Users\Admin\AppData\Local\Temp\HxDSetup.zip:Zone.Identifier firefox.exe -
Opens file in notepad (likely ransom note) 1 IoCs
Processes:
NOTEPAD.EXEpid process 1372 NOTEPAD.EXE -
Suspicious behavior: EnumeratesProcesses 6 IoCs
Processes:
rook1.exeHxDSetup.tmppid process 2424 rook1.exe 2424 rook1.exe 2424 rook1.exe 2424 rook1.exe 2988 HxDSetup.tmp 2988 HxDSetup.tmp -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
Processes:
HxD.exepid process 2536 HxD.exe -
Suspicious use of AdjustPrivilegeToken 6 IoCs
Processes:
vssvc.exefirefox.exedescription pid process Token: SeBackupPrivilege 4080 vssvc.exe Token: SeRestorePrivilege 4080 vssvc.exe Token: SeAuditPrivilege 4080 vssvc.exe Token: SeDebugPrivilege 2292 firefox.exe Token: SeDebugPrivilege 2292 firefox.exe Token: SeDebugPrivilege 2292 firefox.exe -
Suspicious use of FindShellTrayWindow 8 IoCs
Processes:
firefox.exeHxDSetup.tmpHxD.exepid process 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2988 HxDSetup.tmp 2536 HxD.exe -
Suspicious use of SendNotifyMessage 5 IoCs
Processes:
firefox.exepid process 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe -
Suspicious use of SetWindowsHookEx 13 IoCs
Processes:
firefox.exeHxD.exepid process 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2292 firefox.exe 2536 HxD.exe 2536 HxD.exe 2536 HxD.exe 2536 HxD.exe 2536 HxD.exe 2536 HxD.exe -
Suspicious use of WriteProcessMemory 64 IoCs
Processes:
rook1.execmd.execmd.exefirefox.exefirefox.exedescription pid process target process PID 2424 wrote to memory of 3548 2424 rook1.exe cmd.exe PID 2424 wrote to memory of 3548 2424 rook1.exe cmd.exe PID 3548 wrote to memory of 2972 3548 cmd.exe vssadmin.exe PID 3548 wrote to memory of 2972 3548 cmd.exe vssadmin.exe PID 2424 wrote to memory of 668 2424 rook1.exe cmd.exe PID 2424 wrote to memory of 668 2424 rook1.exe cmd.exe PID 668 wrote to memory of 352 668 cmd.exe vssadmin.exe PID 668 wrote to memory of 352 668 cmd.exe vssadmin.exe PID 2544 wrote to memory of 2292 2544 firefox.exe firefox.exe PID 2544 wrote to memory of 2292 2544 firefox.exe firefox.exe PID 2544 wrote to memory of 2292 2544 firefox.exe firefox.exe PID 2544 wrote to memory of 2292 2544 firefox.exe firefox.exe PID 2544 wrote to memory of 2292 2544 firefox.exe firefox.exe PID 2544 wrote to memory of 2292 2544 firefox.exe firefox.exe PID 2544 wrote to memory of 2292 2544 firefox.exe firefox.exe PID 2544 wrote to memory of 2292 2544 firefox.exe firefox.exe PID 2544 wrote to memory of 2292 2544 firefox.exe firefox.exe PID 2292 wrote to memory of 3228 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 3228 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 252 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 4044 2292 firefox.exe firefox.exe PID 2292 wrote to memory of 4044 2292 firefox.exe firefox.exe
Processes
-
C:\Users\Admin\AppData\Local\Temp\rook1.exe"C:\Users\Admin\AppData\Local\Temp\rook1.exe"1⤵
- Modifies extensions of user files
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2424 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet2⤵
- Suspicious use of WriteProcessMemory
PID:3548 -
C:\Windows\system32\vssadmin.exevssadmin.exe delete shadows /all /quiet3⤵
- Interacts with shadow copies
PID:2972
-
-
-
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /c vssadmin.exe delete shadows /all /quiet2⤵
- Suspicious use of WriteProcessMemory
PID:668 -
C:\Windows\system32\vssadmin.exevssadmin.exe delete shadows /all /quiet3⤵
- Interacts with shadow copies
PID:352
-
-
-
C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4080
-
C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Public\Desktop\HowToRestoreYourFiles.txt1⤵
- Opens file in notepad (likely ransom note)
PID:1372
-
C:\Program Files\Mozilla Firefox\firefox.exe"C:\Program Files\Mozilla Firefox\firefox.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:2544 -
C:\Program Files\Mozilla Firefox\firefox.exe"C:\Program Files\Mozilla Firefox\firefox.exe"2⤵
- Checks processor information in registry
- Modifies registry class
- NTFS ADS
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2292 -
C:\Program Files\Mozilla Firefox\firefox.exe"C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="2292.0.362930531\1637752897" -parentBuildID 20200403170909 -prefsHandle 1532 -prefMapHandle 1196 -prefsLen 1 -prefMapSize 219680 -appdir "C:\Program Files\Mozilla Firefox\browser" - 2292 "\\.\pipe\gecko-crash-server-pipe.2292" 1612 gpu3⤵PID:3228
-
-
C:\Program Files\Mozilla Firefox\firefox.exe"C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="2292.3.1026824613\1963083986" -childID 1 -isForBrowser -prefsHandle 2172 -prefMapHandle 2112 -prefsLen 156 -prefMapSize 219680 -parentBuildID 20200403170909 -appdir "C:\Program Files\Mozilla Firefox\browser" - 2292 "\\.\pipe\gecko-crash-server-pipe.2292" 1344 tab3⤵PID:252
-
-
C:\Program Files\Mozilla Firefox\firefox.exe"C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="2292.13.1115367397\557600314" -childID 2 -isForBrowser -prefsHandle 3412 -prefMapHandle 3408 -prefsLen 7013 -prefMapSize 219680 -parentBuildID 20200403170909 -appdir "C:\Program Files\Mozilla Firefox\browser" - 2292 "\\.\pipe\gecko-crash-server-pipe.2292" 3464 tab3⤵PID:4044
-
-
C:\Program Files\Mozilla Firefox\firefox.exe"C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="2292.20.1344329058\1002893433" -childID 3 -isForBrowser -prefsHandle 2784 -prefMapHandle 4472 -prefsLen 7784 -prefMapSize 219680 -parentBuildID 20200403170909 -appdir "C:\Program Files\Mozilla Firefox\browser" - 2292 "\\.\pipe\gecko-crash-server-pipe.2292" 4284 tab3⤵PID:740
-
-
-
C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵PID:420
-
C:\Users\Admin\AppData\Local\Temp\Temp1_HxDSetup.zip\HxDSetup.exe"C:\Users\Admin\AppData\Local\Temp\Temp1_HxDSetup.zip\HxDSetup.exe"1⤵PID:2608
-
C:\Users\Admin\AppData\Local\Temp\is-HDKK1.tmp\HxDSetup.tmp"C:\Users\Admin\AppData\Local\Temp\is-HDKK1.tmp\HxDSetup.tmp" /SL5="$3023C,2973524,121344,C:\Users\Admin\AppData\Local\Temp\Temp1_HxDSetup.zip\HxDSetup.exe"2⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of FindShellTrayWindow
PID:2988 -
C:\Windows\SysWOW64\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Program Files\HxD\readme.txt3⤵PID:2056
-
-
C:\Program Files\HxD\HxD.exe"C:\Program Files\HxD\HxD.exe"3⤵
- Executes dropped EXE
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
PID:2536 -
C:\Program Files\HxD\HxD.exe"C:\Program Files\HxD\HxD.exe" /chooselang4⤵
- Executes dropped EXE
PID:3200
-
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
-
MD5
14fca45f383b3de689d38f45c283f71f
SHA15cb16e51c3bb3c63613ffd6d77505db7c5aa4ed6
SHA2569d460040a454deeb3fe69300fe6b9017350e1efcb1f52f7f14a4702d96cb45ca
SHA5120014192bd5f0eb8b2cd80042937ccc0228ff19123b10ee938e3b72a080e3f8d3d215f62b68810d4e06b5fad8322d0327dcd17d0a29fd0db570c0cd7da825634c
-
MD5
14fca45f383b3de689d38f45c283f71f
SHA15cb16e51c3bb3c63613ffd6d77505db7c5aa4ed6
SHA2569d460040a454deeb3fe69300fe6b9017350e1efcb1f52f7f14a4702d96cb45ca
SHA5120014192bd5f0eb8b2cd80042937ccc0228ff19123b10ee938e3b72a080e3f8d3d215f62b68810d4e06b5fad8322d0327dcd17d0a29fd0db570c0cd7da825634c
-
MD5
14fca45f383b3de689d38f45c283f71f
SHA15cb16e51c3bb3c63613ffd6d77505db7c5aa4ed6
SHA2569d460040a454deeb3fe69300fe6b9017350e1efcb1f52f7f14a4702d96cb45ca
SHA5120014192bd5f0eb8b2cd80042937ccc0228ff19123b10ee938e3b72a080e3f8d3d215f62b68810d4e06b5fad8322d0327dcd17d0a29fd0db570c0cd7da825634c
-
MD5
0755d4e1fdf379c36369e96f6f6d8fa8
SHA1f0d81e81e06fb10d2844acdad3a89e32ac624ec2
SHA256ca4f74de91db68db75a685640957140c42d8d01659c20cf72eb771a0f7bcba2d
SHA51256982440f67d2a04418e885cccdb9c1916a69ca58564d660fef8a8d88ed74c949b99ddff4da1bf6f654e6f3003488a5e2d3426cf64b055bdd51a423648334e3f
-
MD5
34acc2bdb45a9c436181426828c4cb49
SHA15adaa1ac822e6128b8d4b59a54d19901880452ae
SHA2569c81817acd4982632d8c7f1df3898fca1477577738184265d735f49fc5480f07
SHA512134ff4022571efd46f7a62e99b857ebe834e9916c786345908010f9e1fb90be226b740ddee16ae9290fe45c86be7238c4555e422abe66a461d11545e19734beb
-
MD5
34acc2bdb45a9c436181426828c4cb49
SHA15adaa1ac822e6128b8d4b59a54d19901880452ae
SHA2569c81817acd4982632d8c7f1df3898fca1477577738184265d735f49fc5480f07
SHA512134ff4022571efd46f7a62e99b857ebe834e9916c786345908010f9e1fb90be226b740ddee16ae9290fe45c86be7238c4555e422abe66a461d11545e19734beb
-
MD5
392b810f865591aa5ec210e849ae769f
SHA1f3fd0c8f2a347e168ef392e38c52f4134987a3a6
SHA25678b33626b46709ebe04edd99ea813ed291183bebb025ea5e4783ca2260811943
SHA5125d650d9045243ce2495a845683b3252419bc283fe9ecec85b56de0a179a5df77d8ddf8ccb41ff555043bf1e9a3c9a0a3e1efec17cc2d291b5236589a80df0f04
-
MD5
00f71cde522689585eaa9c62385afa22
SHA1350e319806f7a71267a5e4a749eb190ead38dbb0
SHA256b14ec2fcccac5059464e800edf56049c0277124abd60ee49c1f726861df925bf
SHA51247442d335f16e259c4593370467c741ac2b41f329330afdd649b89b44c4233edd7d2af70883403993d6022c617235c20b89ae667ca4b3f82d678836adc34f4df