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Analysis
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max time kernel
143s -
max time network
156s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
07/06/2024, 22:43
Static task
static1
Behavioral task
behavioral1
Sample
2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe
Resource
win10v2004-20240226-en
General
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Target
2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe
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Size
135KB
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MD5
77d75393a71b68e6d4315225d2776c12
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SHA1
88124a6e0dade8408d687b9bcac066275c8aea8e
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SHA256
a697fa27a6a63f248d12c4716bf5feaf678c09aeea695bd8e8a0fd8829e94287
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SHA512
22dd2c6a7fe273abe440d2463d3b04e28e79d8ce1d7d9b266c6f56ea075065369f6bf5b2941a360dee313db55bded95386850e806193dc4c813b60848adac16f
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SSDEEP
3072:ZRpAyazIliazTJM8yKI7swt99g0kFZeAmkD5zXv:xZ8azFdyLTt9UFcAmkZ
Malware Config
Signatures
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Executes dropped EXE 2 IoCs
pid Process 1104 m8FhYtsJ57ViW4Q.exe 3832 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
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-06-07_77d75393a71b68e6d4315225d2776c12_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
description ioc Process File created C:\Windows\CTS.exe 2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3452 2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe Token: SeDebugPrivilege 3832 CTS.exe -
Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 3452 wrote to memory of 1104 3452 2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe 91 PID 3452 wrote to memory of 1104 3452 2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe 91 PID 3452 wrote to memory of 1104 3452 2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe 91 PID 3452 wrote to memory of 3832 3452 2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe 92 PID 3452 wrote to memory of 3832 3452 2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe 92 PID 3452 wrote to memory of 3832 3452 2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe 92
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe"1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3452 -
C:\Users\Admin\AppData\Local\Temp\m8FhYtsJ57ViW4Q.exeC:\Users\Admin\AppData\Local\Temp\m8FhYtsJ57ViW4Q.exe2⤵
- Executes dropped EXE
PID:1104
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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
PID:3832
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1416 --field-trial-handle=3240,i,13319578961094268484,16557498665191861597,262144 --variations-seed-version /prefetch:81⤵PID:4836
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
789KB
MD5612d539f332504d27446f9b46cb954c0
SHA10c87d98d00686e6d12123613cd47f8b45684397e
SHA256dd153332eb24465ddab430b54802fde1d3ed05568c8641633c40b1342fde708e
SHA51208cb2b99300e2919657898dba8a097cdd8ce1b60a48aa5e9db8177daef87b0433ede08a6432042f882c4faa115adb0d6bb018965fada99f281d574f134e121e1
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Filesize
64KB
MD5a32a382b8a5a906e03a83b4f3e5b7a9b
SHA111e2bdd0798761f93cce363329996af6c17ed796
SHA25675f12ea2f30d9c0d872dade345f30f562e6d93847b6a509ba53beec6d0b2c346
SHA512ec87dd957be21b135212454646dcabdd7ef9442cf714e2c1f6b42b81f0c3fa3b1875bde9a8b538e8a0aa2190225649c29e9ed0f25176e7659e55e422dd4efe4c
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Filesize
71KB
MD5f9d4ab0a726adc9b5e4b7d7b724912f1
SHA13d42ca2098475924f70ee4a831c4f003b4682328
SHA256b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA51222a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432