Analysis
-
max time kernel
62s -
max time network
52s -
platform
windows10-2004_x64 -
resource
win10v2004-20240419-en -
resource tags
arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system -
submitted
28-04-2024 21:00
Static task
static1
Behavioral task
behavioral1
Sample
2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe
Resource
win10v2004-20240419-en
General
-
Target
2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe
-
Size
332KB
-
MD5
f56ea65bc1da76bdc390e33ad0c58485
-
SHA1
554956c195c950154d3451a9ea901549b366cf9a
-
SHA256
d9febace6601e08cbea814cd13fe82104eb432466058d05068c88e2e46c9d1f8
-
SHA512
44a267ba01a89649fdbef57ce69aea1a4f1b995ad75e57cc1c60e17dd207a21292fc6993cb2d8175d102b09de9a08f1a11a68f00e19d2bcc806fd8277ad2255b
-
SSDEEP
6144:hZMazgjAhS4HhQ22O0jF6cE01/zd6k2QoSjyREI+L6oMtP5T:hS0owS4BQGH+hnoSLhSl
Malware Config
Signatures
-
Executes dropped EXE 2 IoCs
Processes:
BKO2eVu3aYVZMsH.exeCTS.exepid process 316 BKO2eVu3aYVZMsH.exe 4508 CTS.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
-
Adds Run key to start application 2 TTPs 2 IoCs
Processes:
2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exeCTS.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" CTS.exe -
Drops file in Windows directory 2 IoCs
Processes:
2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exeCTS.exedescription ioc process File created C:\Windows\CTS.exe 2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exeCTS.exedescription pid process Token: SeDebugPrivilege 4276 2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe Token: SeDebugPrivilege 4508 CTS.exe -
Suspicious use of WriteProcessMemory 5 IoCs
Processes:
2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exedescription pid process target process PID 4276 wrote to memory of 316 4276 2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe BKO2eVu3aYVZMsH.exe PID 4276 wrote to memory of 316 4276 2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe BKO2eVu3aYVZMsH.exe PID 4276 wrote to memory of 4508 4276 2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe CTS.exe PID 4276 wrote to memory of 4508 4276 2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe CTS.exe PID 4276 wrote to memory of 4508 4276 2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe CTS.exe
Processes
-
C:\Users\Admin\AppData\Local\Temp\2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-04-28_f56ea65bc1da76bdc390e33ad0c58485_bkransomware.exe"1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4276 -
C:\Users\Admin\AppData\Local\Temp\BKO2eVu3aYVZMsH.exeC:\Users\Admin\AppData\Local\Temp\BKO2eVu3aYVZMsH.exe2⤵
- Executes dropped EXE
PID:316 -
C:\Windows\CTS.exe"C:\Windows\CTS.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:4508
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
-
C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xmlFilesize
392KB
MD5f6a4ead3952f673ae7f827ed4dea95f2
SHA1f2a8e43ee8b0ccc478d67534e7fcb823e8283839
SHA256a5233014f6cc657d8a18ed825f8ef2e819dd3fc0896850a44a996da75de41047
SHA512c2581240645d8215e31a8e9c4d22d13e2f7f02779f08909c83960078891de0c4fd383eb6cbcfebe22d214e03523cfbb70cab697b2c757805e030759bdc72d92a
-
C:\Users\Admin\AppData\Local\Temp\BKO2eVu3aYVZMsH.exeFilesize
261KB
MD59dce6a120d094e5c925b967c4bb36277
SHA11ab60840e8d8ed14619fab2d1559f989f01f01a9
SHA2563052784f3683c2bbe95f59560eb311e75f1eac7aa5476a91bbd9fe4d2aef880a
SHA51220a7a4b8ecb1262ed730c8299ad0ada2ad93327f0886e5fdefc89564ff7510595ec53ac5aa88747e0548315c3037125d83756e3ae4d9a813cc553c12991c94df
-
C:\Windows\CTS.exeFilesize
71KB
MD566df4ffab62e674af2e75b163563fc0b
SHA1dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA5121588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25