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Analysis
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max time kernel
7s -
platform
windows7_x64 -
resource
win7-20220812-en -
resource tags
arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system -
submitted
21/09/2022, 04:05
Behavioral task
behavioral1
Sample
HEUR-Trojan-Ransom.MSIL.Agent.gen-02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1.exe
Resource
win7-20220812-en
Behavioral task
behavioral2
Sample
HEUR-Trojan-Ransom.MSIL.Agent.gen-02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1.exe
Resource
win10v2004-20220812-en
General
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Target
HEUR-Trojan-Ransom.MSIL.Agent.gen-02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1.exe
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Size
49KB
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MD5
5e685c7264d47dd21ebfa36a9437d142
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SHA1
0984924bd1ff568a94e16240935c03a91e7a8ddf
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SHA256
02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1
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SHA512
bd7b34592aecaa4184c191159acc7724a0f393efe98673a36596ff7665e9415b49238293f187a36564287e8cfdbb7478fc1759f81a3b5d9b52c3f7e47b5cf294
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SSDEEP
768:bqo2mpeWxyfr9+d4mZryx7L2ksQ1QCEez:2o2Ixyfr9+dsx32XKZz
Malware Config
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 4 IoCs
resource yara_rule behavioral1/memory/2000-54-0x0000000000D20000-0x0000000000D32000-memory.dmp family_chaos behavioral1/files/0x00140000000054ab-56.dat family_chaos behavioral1/files/0x00140000000054ab-57.dat family_chaos behavioral1/memory/1656-58-0x00000000009B0000-0x00000000009C2000-memory.dmp family_chaos -
Executes dropped EXE 1 IoCs
pid Process 1656 PENTA.exe -
Modifies extensions of user files 3 IoCs
Ransomware generally changes the extension on encrypted files.
description ioc Process File renamed C:\Users\Admin\Pictures\CompareEnable.png => C:\Users\Admin\Pictures\CompareEnable.png.PENTA PENTA.exe File renamed C:\Users\Admin\Pictures\DismountExpand.raw => C:\Users\Admin\Pictures\DismountExpand.raw.PENTA PENTA.exe File renamed C:\Users\Admin\Pictures\FindHide.raw => C:\Users\Admin\Pictures\FindHide.raw.PENTA PENTA.exe -
Drops startup file 3 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\PENTA.url PENTA.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\PENTA.url PENTA.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\PENTA_README.txt PENTA.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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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Suspicious behavior: EnumeratesProcesses 3 IoCs
pid Process 2000 HEUR-Trojan-Ransom.MSIL.Agent.gen-02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1.exe 1656 PENTA.exe 1656 PENTA.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2000 HEUR-Trojan-Ransom.MSIL.Agent.gen-02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1.exe Token: SeDebugPrivilege 1656 PENTA.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 2000 wrote to memory of 1656 2000 HEUR-Trojan-Ransom.MSIL.Agent.gen-02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1.exe 28 PID 2000 wrote to memory of 1656 2000 HEUR-Trojan-Ransom.MSIL.Agent.gen-02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1.exe 28 PID 2000 wrote to memory of 1656 2000 HEUR-Trojan-Ransom.MSIL.Agent.gen-02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1.exe 28
Processes
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C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan-Ransom.MSIL.Agent.gen-02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1.exe"C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan-Ransom.MSIL.Agent.gen-02db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2000 -
C:\Users\Admin\AppData\Roaming\PENTA.exe"C:\Users\Admin\AppData\Roaming\PENTA.exe"2⤵
- Executes dropped EXE
- Modifies extensions of user files
- Drops startup file
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1656
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
49KB
MD55e685c7264d47dd21ebfa36a9437d142
SHA10984924bd1ff568a94e16240935c03a91e7a8ddf
SHA25602db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1
SHA512bd7b34592aecaa4184c191159acc7724a0f393efe98673a36596ff7665e9415b49238293f187a36564287e8cfdbb7478fc1759f81a3b5d9b52c3f7e47b5cf294
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Filesize
49KB
MD55e685c7264d47dd21ebfa36a9437d142
SHA10984924bd1ff568a94e16240935c03a91e7a8ddf
SHA25602db375475c56ba5c97f602e4c2eea8cac66e08d9a31ec7efabe35210b0d0aa1
SHA512bd7b34592aecaa4184c191159acc7724a0f393efe98673a36596ff7665e9415b49238293f187a36564287e8cfdbb7478fc1759f81a3b5d9b52c3f7e47b5cf294