Analysis
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max time kernel
93s -
max time network
122s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system -
submitted
23-05-2024 03:47
Static task
static1
Behavioral task
behavioral1
Sample
2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe
Resource
win7-20240419-en
Behavioral task
behavioral2
Sample
2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe
Resource
win10v2004-20240508-en
General
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Target
2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe
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Size
71KB
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MD5
a5c6f0537e7a3371b7cf4799e09d710c
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SHA1
72f0c2dc4c404774e3fe83c87bbad4fc96283397
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SHA256
252d8c1d88c2a702e0b082506f30e603b7fb54bb1081f121aa81e32b49dbd2df
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SHA512
70f38764f863c98788e594c81376786011538ea809d2d899876fe12fc07ceb81909f16eca1f31fdddf7db0fba2187184d61c610966c4615b6841dd14320e34f0
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SSDEEP
1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTL:ZRpAyazIliazTL
Malware Config
Signatures
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Executes dropped EXE 1 IoCs
Processes:
CTS.exepid process 1500 CTS.exe -
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
Processes:
CTS.exe2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" CTS.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe -
Drops file in Windows directory 2 IoCs
Processes:
2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exeCTS.exedescription ioc process File created C:\Windows\CTS.exe 2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exeCTS.exedescription pid process Token: SeDebugPrivilege 4272 2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe Token: SeDebugPrivilege 1500 CTS.exe -
Suspicious use of WriteProcessMemory 3 IoCs
Processes:
2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exedescription pid process target process PID 4272 wrote to memory of 1500 4272 2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe CTS.exe PID 4272 wrote to memory of 1500 4272 2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe CTS.exe PID 4272 wrote to memory of 1500 4272 2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe CTS.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-23_a5c6f0537e7a3371b7cf4799e09d710c_bkransomware.exe"1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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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
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xmlFilesize
394KB
MD576cf0b9efad0007577ea5a4835f71af5
SHA1f98c030a912b1c5a5b156193a697c26b3e66db88
SHA2560a54c170fa82d930e23d34e94000a002f082388f89ee490179d915c18c9dcc3d
SHA512ef6ce88bc430694e2aafb7209a489ab0c6364c57f9a92d5238b5aa9b2f94138c92a96da363511735e442df9a5a2e0fb8181f93d8f20ac334575f6e3451935b56
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C:\Users\Admin\AppData\Local\Temp\IdeazssPcUHpWhW.exeFilesize
71KB
MD58305cb1f41921e0e2dae10da38dca014
SHA1a09fc53d72050ea36711f222205250fb6807530a
SHA256d6327ecf57c4b46a06bf73b71858a4f2f207c1b4b4338476bbc37f69b2ea793d
SHA5126b73e955be7804cc2b160c02f7cf254339493ecc783bcfa3a547a8aff80c458b0799208ead53039692019620d47f5196a984d0d48413994e0da7fde23653a83b
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C:\Windows\CTS.exeFilesize
71KB
MD5f9d4ab0a726adc9b5e4b7d7b724912f1
SHA13d42ca2098475924f70ee4a831c4f003b4682328
SHA256b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA51222a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432