Analysis
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max time kernel
120s -
max time network
124s -
platform
windows7_x64 -
resource
win7-20240221-en -
resource tags
arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system -
submitted
27-04-2024 22:31
Static task
static1
Behavioral task
behavioral1
Sample
2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe
Resource
win10v2004-20240419-en
General
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Target
2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe
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Size
96KB
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MD5
55fa45af8114e00b1f93d483d8f38830
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SHA1
8cf8f15c10546fdfa1a26a4143adcd803274e883
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SHA256
26bf5b3b634c6cc10907b2bf9d0e018bd4c5da983276fb4059527a138e5b7a05
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SHA512
81eb52590250f2ed7e179f02ac1216e9fedd3013d5563490613b4d4d94c9b6561982622f9d038ef271e774be2273f89be9e3fc911bfd5635e96c6e3c89a3ff7d
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SSDEEP
1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTMUdytRPFP/Ag3jMq8cmHD:ZRpAyazIliazTMnRP5/A0wq81
Malware Config
Signatures
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Executes dropped EXE 2 IoCs
Processes:
vCxo30AC50ELnQB.exeCTS.exepid process 1752 vCxo30AC50ELnQB.exe 3064 CTS.exe -
Loads dropped DLL 3 IoCs
Processes:
2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exepid process 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe 2980 -
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:
2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exeCTS.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-04-27_55fa45af8114e00b1f93d483d8f38830_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:
2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exeCTS.exedescription ioc process File created C:\Windows\CTS.exe 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exeCTS.exedescription pid process Token: SeDebugPrivilege 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe Token: SeDebugPrivilege 3064 CTS.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exedescription pid process target process PID 1284 wrote to memory of 1752 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe vCxo30AC50ELnQB.exe PID 1284 wrote to memory of 1752 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe vCxo30AC50ELnQB.exe PID 1284 wrote to memory of 1752 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe vCxo30AC50ELnQB.exe PID 1284 wrote to memory of 1752 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe vCxo30AC50ELnQB.exe PID 1284 wrote to memory of 3064 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe CTS.exe PID 1284 wrote to memory of 3064 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe CTS.exe PID 1284 wrote to memory of 3064 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe CTS.exe PID 1284 wrote to memory of 3064 1284 2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe CTS.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-04-27_55fa45af8114e00b1f93d483d8f38830_bkransomware.exe"1⤵
- Loads dropped DLL
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\vCxo30AC50ELnQB.exeC:\Users\Admin\AppData\Local\Temp\vCxo30AC50ELnQB.exe2⤵
- Executes dropped EXE
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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\Temp\vCxo30AC50ELnQB.exeFilesize
96KB
MD5686f7f0e3b965c9565c01aab4402db70
SHA1b1582afe78340363de820d1874f2c7717c203919
SHA256a3a1729df45f32e57e486b41cd2d52f7921078c17fac8e7ac4341b6786677a4f
SHA512743fe283a4737a92f04c657d752297a3e7bc0e4aa2bd69a3f2fad60d38dc0246414e70644ae8307268448705f784ebf93b1eff9a8eb40bb9fe4bdf44858b23f8
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C:\Windows\CTS.exeFilesize
71KB
MD5f9d4ab0a726adc9b5e4b7d7b724912f1
SHA13d42ca2098475924f70ee4a831c4f003b4682328
SHA256b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA51222a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432
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\Users\Admin\AppData\Local\Temp\vCxo30AC50ELnQB.exeFilesize
25KB
MD5abbd49c180a2f8703f6306d6fa731fdc
SHA1d63f4bfe7f74936b2fbace803e3da6103fbf6586
SHA2565f411c0bd9ed9a42b0f07ed568c7d0cf358a83063b225a1f8f7da3296dde90f1
SHA512290dd984acc451b778f3db8c510bae7aec1d9547c3ad0a1829df731c136e4ecc9a37dc6a786cf8f1ecc4d14339aed1288af25055f450f6f953138c8d4d5c36e9
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memory/1752-15-0x0000000000400000-0x000000000040D000-memory.dmpFilesize
52KB