Analysis
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max time kernel
127s -
max time network
120s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
24-12-2024 13:15
Behavioral task
behavioral1
Sample
B.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
B.exe
Resource
win10v2004-20241007-en
Behavioral task
behavioral3
Sample
Build.exe
Resource
win7-20240903-en
Behavioral task
behavioral4
Sample
Build.exe
Resource
win10v2004-20241007-en
Behavioral task
behavioral5
Sample
READ.exe
Resource
win7-20240708-en
Behavioral task
behavioral6
Sample
READ.exe
Resource
win10v2004-20241007-en
Behavioral task
behavioral7
Sample
rb.exe
Resource
win7-20241023-en
Behavioral task
behavioral8
Sample
rb.exe
Resource
win10v2004-20241007-en
General
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Target
Build.exe
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Size
669KB
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MD5
b446b1c86f3d27bb39783f9d3a112a40
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SHA1
d9f66f8db27686f4f3b2c7d17557c84077ac801f
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SHA256
1f5eefc1feb47e11e53f82055ca0921fc1b1299dffa7972c6faeff1904fdad1d
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SHA512
c2b7682c265060c1c62be0b4dceba7fed6882b9fdc9cbbd1d379608a482bf215d81a2a3c03cc2df709bc936ee7d06ff1250dde92808bd0e0d1f1ee3410c35d9a
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SSDEEP
12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8DiKD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HWPKrKe
Malware Config
Extracted
\Device\HarddiskVolume1\Boot\HOW_TO_RECOVER_DATA.html
Signatures
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MedusaLocker
Ransomware with several variants first seen in September 2019.
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MedusaLocker payload 1 IoCs
resource yara_rule behavioral3/files/0x000e000000012275-859.dat family_medusalocker -
Medusalocker family
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description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" Build.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" Build.exe -
Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Renames multiple (279) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Executes dropped EXE 1 IoCs
pid Process 688 svhost.exe -
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" Build.exe -
Drops desktop.ini file(s) 1 IoCs
description ioc Process File opened for modification \??\Z:\$RECYCLE.BIN\S-1-5-21-1846800975-3917212583-2893086201-1000\desktop.ini Build.exe -
Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
description ioc Process File opened (read-only) \??\R: Build.exe File opened (read-only) \??\W: Build.exe File opened (read-only) \??\X: Build.exe File opened (read-only) \??\Y: Build.exe File opened (read-only) \??\J: Build.exe File opened (read-only) \??\K: Build.exe File opened (read-only) \??\O: Build.exe File opened (read-only) \??\P: Build.exe File opened (read-only) \??\S: Build.exe File opened (read-only) \??\A: Build.exe File opened (read-only) \??\H: Build.exe File opened (read-only) \??\M: Build.exe File opened (read-only) \??\N: Build.exe File opened (read-only) \??\E: Build.exe File opened (read-only) \??\G: Build.exe File opened (read-only) \??\V: Build.exe File opened (read-only) \??\Z: Build.exe File opened (read-only) \??\T: Build.exe File opened (read-only) \??\U: Build.exe File opened (read-only) \??\F: Build.exe File opened (read-only) \??\B: Build.exe File opened (read-only) \??\I: Build.exe File opened (read-only) \??\L: Build.exe File opened (read-only) \??\Q: Build.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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System Location Discovery: System Language Discovery 1 TTPs 7 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language wmic.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language vssadmin.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language wmic.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language vssadmin.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language wmic.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language Build.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language vssadmin.exe -
Interacts with shadow copies 3 TTPs 3 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2712 vssadmin.exe 2556 vssadmin.exe 3004 vssadmin.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe 2788 Build.exe -
Suspicious use of AdjustPrivilegeToken 63 IoCs
description pid Process Token: SeBackupPrivilege 2672 vssvc.exe Token: SeRestorePrivilege 2672 vssvc.exe Token: SeAuditPrivilege 2672 vssvc.exe Token: SeIncreaseQuotaPrivilege 2656 wmic.exe Token: SeSecurityPrivilege 2656 wmic.exe Token: SeTakeOwnershipPrivilege 2656 wmic.exe Token: SeLoadDriverPrivilege 2656 wmic.exe Token: SeSystemProfilePrivilege 2656 wmic.exe Token: SeSystemtimePrivilege 2656 wmic.exe Token: SeProfSingleProcessPrivilege 2656 wmic.exe Token: SeIncBasePriorityPrivilege 2656 wmic.exe Token: SeCreatePagefilePrivilege 2656 wmic.exe Token: SeBackupPrivilege 2656 wmic.exe Token: SeRestorePrivilege 2656 wmic.exe Token: SeShutdownPrivilege 2656 wmic.exe Token: SeDebugPrivilege 2656 wmic.exe Token: SeSystemEnvironmentPrivilege 2656 wmic.exe Token: SeRemoteShutdownPrivilege 2656 wmic.exe Token: SeUndockPrivilege 2656 wmic.exe Token: SeManageVolumePrivilege 2656 wmic.exe Token: 33 2656 wmic.exe Token: 34 2656 wmic.exe Token: 35 2656 wmic.exe Token: SeIncreaseQuotaPrivilege 2632 wmic.exe Token: SeSecurityPrivilege 2632 wmic.exe Token: SeTakeOwnershipPrivilege 2632 wmic.exe Token: SeLoadDriverPrivilege 2632 wmic.exe Token: SeSystemProfilePrivilege 2632 wmic.exe Token: SeSystemtimePrivilege 2632 wmic.exe Token: SeProfSingleProcessPrivilege 2632 wmic.exe Token: SeIncBasePriorityPrivilege 2632 wmic.exe Token: SeCreatePagefilePrivilege 2632 wmic.exe Token: SeBackupPrivilege 2632 wmic.exe Token: SeRestorePrivilege 2632 wmic.exe Token: SeShutdownPrivilege 2632 wmic.exe Token: SeDebugPrivilege 2632 wmic.exe Token: SeSystemEnvironmentPrivilege 2632 wmic.exe Token: SeRemoteShutdownPrivilege 2632 wmic.exe Token: SeUndockPrivilege 2632 wmic.exe Token: SeManageVolumePrivilege 2632 wmic.exe Token: 33 2632 wmic.exe Token: 34 2632 wmic.exe Token: 35 2632 wmic.exe Token: SeIncreaseQuotaPrivilege 1800 wmic.exe Token: SeSecurityPrivilege 1800 wmic.exe Token: SeTakeOwnershipPrivilege 1800 wmic.exe Token: SeLoadDriverPrivilege 1800 wmic.exe Token: SeSystemProfilePrivilege 1800 wmic.exe Token: SeSystemtimePrivilege 1800 wmic.exe Token: SeProfSingleProcessPrivilege 1800 wmic.exe Token: SeIncBasePriorityPrivilege 1800 wmic.exe Token: SeCreatePagefilePrivilege 1800 wmic.exe Token: SeBackupPrivilege 1800 wmic.exe Token: SeRestorePrivilege 1800 wmic.exe Token: SeShutdownPrivilege 1800 wmic.exe Token: SeDebugPrivilege 1800 wmic.exe Token: SeSystemEnvironmentPrivilege 1800 wmic.exe Token: SeRemoteShutdownPrivilege 1800 wmic.exe Token: SeUndockPrivilege 1800 wmic.exe Token: SeManageVolumePrivilege 1800 wmic.exe Token: 33 1800 wmic.exe Token: 34 1800 wmic.exe Token: 35 1800 wmic.exe -
Suspicious use of WriteProcessMemory 28 IoCs
description pid Process procid_target PID 2788 wrote to memory of 2712 2788 Build.exe 31 PID 2788 wrote to memory of 2712 2788 Build.exe 31 PID 2788 wrote to memory of 2712 2788 Build.exe 31 PID 2788 wrote to memory of 2712 2788 Build.exe 31 PID 2788 wrote to memory of 2656 2788 Build.exe 34 PID 2788 wrote to memory of 2656 2788 Build.exe 34 PID 2788 wrote to memory of 2656 2788 Build.exe 34 PID 2788 wrote to memory of 2656 2788 Build.exe 34 PID 2788 wrote to memory of 2556 2788 Build.exe 36 PID 2788 wrote to memory of 2556 2788 Build.exe 36 PID 2788 wrote to memory of 2556 2788 Build.exe 36 PID 2788 wrote to memory of 2556 2788 Build.exe 36 PID 2788 wrote to memory of 2632 2788 Build.exe 38 PID 2788 wrote to memory of 2632 2788 Build.exe 38 PID 2788 wrote to memory of 2632 2788 Build.exe 38 PID 2788 wrote to memory of 2632 2788 Build.exe 38 PID 2788 wrote to memory of 3004 2788 Build.exe 40 PID 2788 wrote to memory of 3004 2788 Build.exe 40 PID 2788 wrote to memory of 3004 2788 Build.exe 40 PID 2788 wrote to memory of 3004 2788 Build.exe 40 PID 2788 wrote to memory of 1800 2788 Build.exe 42 PID 2788 wrote to memory of 1800 2788 Build.exe 42 PID 2788 wrote to memory of 1800 2788 Build.exe 42 PID 2788 wrote to memory of 1800 2788 Build.exe 42 PID 1812 wrote to memory of 688 1812 taskeng.exe 46 PID 1812 wrote to memory of 688 1812 taskeng.exe 46 PID 1812 wrote to memory of 688 1812 taskeng.exe 46 PID 1812 wrote to memory of 688 1812 taskeng.exe 46 -
System policy modification 1 TTPs 3 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" Build.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" Build.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1" Build.exe -
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
Processes
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C:\Users\Admin\AppData\Local\Temp\Build.exe"C:\Users\Admin\AppData\Local\Temp\Build.exe"1⤵
- UAC bypass
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Enumerates connected drives
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2788 -
C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- System Location Discovery: System Language Discovery
- Interacts with shadow copies
PID:2712
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2656
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- System Location Discovery: System Language Discovery
- Interacts with shadow copies
PID:2556
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:2632
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet2⤵
- System Location Discovery: System Language Discovery
- Interacts with shadow copies
PID:3004
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1800
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2672
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C:\Windows\system32\taskeng.exetaskeng.exe {A18B84A6-D3AD-4CCE-AD4A-60E508992C90} S-1-5-21-1846800975-3917212583-2893086201-1000:ZQABOPWE\Admin:Interactive:[1]1⤵
- Suspicious use of WriteProcessMemory
PID:1812 -
C:\Users\Admin\AppData\Roaming\svhost.exeC:\Users\Admin\AppData\Roaming\svhost.exe2⤵
- Executes dropped EXE
PID:688
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Network
MITRE ATT&CK Enterprise v15
Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Direct Volume Access
1Impair Defenses
1Disable or Modify Tools
1Indicator Removal
2File Deletion
2Modify Registry
2Credential Access
Credentials from Password Stores
1Credentials from Web Browsers
1Unsecured Credentials
1Credentials In Files
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
669KB
MD5b446b1c86f3d27bb39783f9d3a112a40
SHA1d9f66f8db27686f4f3b2c7d17557c84077ac801f
SHA2561f5eefc1feb47e11e53f82055ca0921fc1b1299dffa7972c6faeff1904fdad1d
SHA512c2b7682c265060c1c62be0b4dceba7fed6882b9fdc9cbbd1d379608a482bf215d81a2a3c03cc2df709bc936ee7d06ff1250dde92808bd0e0d1f1ee3410c35d9a
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Filesize
16KB
MD52815a1495277f405770fa2bf4bc5e180
SHA10a29d6e2af6e168ba5e32a8f46d7fde15aed9e43
SHA256efc3c71177e81369cbc2253f614adb800ee2189555b964baa97b9cba184f2aca
SHA512f9e2ec249443085155ce443e5599baabde8596d9e67fdeedddb6c91c76fc10f71cb7abf3669444172892e67dfdd8a6507a53aed063af6130d772a37959457c02
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Filesize
536B
MD52efcd161e1638e1b1c9f996976e0e363
SHA17c52102fe5877cae82cec8631e9fb3bb748d4b63
SHA2567b0b74dd7edcec96dcdce3e599e022f668a9701c88aac3408b09b5f96f33ae79
SHA5122d6b9419598b03317f263bbcc774d5f0920f45763a655ff4a314a4f4f65a5dc2635150acb3c2f60840f99b4a1237e808f53ce1d66a47294a1668e99374f5ea7a
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Filesize
5KB
MD574d6f60d97a917ea52250e6fac93d72f
SHA15ca5de15837a5362a05f8a934a64070ab467b89c
SHA2566e1169f68ba5ec64716313811e6d5d7afa19a34d2bc855849e2bad9deda56fd8
SHA512a1cb3d1f3040be963790add9017762469ff864762e774b8b6ba7eb2a41b41874c275f7b51b9c475319754f498eb666f209c260c4b4a804c675036d234ee1664b