Analysis
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max time kernel
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max time network
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platform
windows7_x64 -
resource
win7-20241010-en -
resource tags
arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system -
submitted
23/03/2025, 21:28
Behavioral task
behavioral1
Sample
FreeVbucks.exe
Resource
win7-20241010-en
Behavioral task
behavioral2
Sample
FreeVbucks.exe
Resource
win10v2004-20250314-en
General
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Target
FreeVbucks.exe
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Size
2.7MB
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MD5
afba56cb6fee3660b751b98418c1fdf1
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SHA1
24364e0e691df3b6e7ebd0e142993fcd6b063984
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SHA256
df86bc46fdd921147c26c94a4cc054efa01bf2fa837756ffc0139171c8a388d8
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SHA512
dd138767c127af7e92a696ceccc3b304c99a52392c66d6e8af41f68be8165af55c99ccc62546afbec2da212f207e9b0a66968e73eaab4d3f2821172ff1d3a99b
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SSDEEP
24576:QC7suY2Mlva2bpmGB3rgkTsZGvSKgkatV9hLG37WDd/OKAVlAL4lGhtl:lbM0NkA8leL
Malware Config
Extracted
C:\Users\Admin\Desktop\read_it.txt
chaos
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 3 IoCs
resource yara_rule behavioral1/memory/1740-1-0x0000000000EF0000-0x00000000011B6000-memory.dmp family_chaos behavioral1/files/0x000a000000012263-6.dat family_chaos behavioral1/memory/2800-8-0x0000000000C50000-0x0000000000F16000-memory.dmp family_chaos -
Chaos family
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Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
pid Process 2096 bcdedit.exe 2212 bcdedit.exe -
pid Process 2160 wbadmin.exe -
Drops startup file 3 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.url svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini svchost.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\read_it.txt svchost.exe -
Executes dropped EXE 1 IoCs
pid Process 2800 svchost.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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Drops desktop.ini file(s) 34 IoCs
description ioc Process File opened for modification C:\Users\Admin\Contacts\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links for United States\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-2039016743-699959520-214465309-1000\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\Sample Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\Sample Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\Sample Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\fumsdhioj.jpg" svchost.exe Set value (str) \REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\Pictures\\My Wallpaper.jpg" svchost.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2136 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 1584 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 2800 svchost.exe -
Suspicious behavior: EnumeratesProcesses 7 IoCs
pid Process 1740 FreeVbucks.exe 1740 FreeVbucks.exe 1740 FreeVbucks.exe 2800 svchost.exe 2800 svchost.exe 2800 svchost.exe 2800 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 1740 FreeVbucks.exe Token: SeDebugPrivilege 2800 svchost.exe Token: SeBackupPrivilege 2260 vssvc.exe Token: SeRestorePrivilege 2260 vssvc.exe Token: SeAuditPrivilege 2260 vssvc.exe Token: SeIncreaseQuotaPrivilege 1420 WMIC.exe Token: SeSecurityPrivilege 1420 WMIC.exe Token: SeTakeOwnershipPrivilege 1420 WMIC.exe Token: SeLoadDriverPrivilege 1420 WMIC.exe Token: SeSystemProfilePrivilege 1420 WMIC.exe Token: SeSystemtimePrivilege 1420 WMIC.exe Token: SeProfSingleProcessPrivilege 1420 WMIC.exe Token: SeIncBasePriorityPrivilege 1420 WMIC.exe Token: SeCreatePagefilePrivilege 1420 WMIC.exe Token: SeBackupPrivilege 1420 WMIC.exe Token: SeRestorePrivilege 1420 WMIC.exe Token: SeShutdownPrivilege 1420 WMIC.exe Token: SeDebugPrivilege 1420 WMIC.exe Token: SeSystemEnvironmentPrivilege 1420 WMIC.exe Token: SeRemoteShutdownPrivilege 1420 WMIC.exe Token: SeUndockPrivilege 1420 WMIC.exe Token: SeManageVolumePrivilege 1420 WMIC.exe Token: 33 1420 WMIC.exe Token: 34 1420 WMIC.exe Token: 35 1420 WMIC.exe Token: SeIncreaseQuotaPrivilege 1420 WMIC.exe Token: SeSecurityPrivilege 1420 WMIC.exe Token: SeTakeOwnershipPrivilege 1420 WMIC.exe Token: SeLoadDriverPrivilege 1420 WMIC.exe Token: SeSystemProfilePrivilege 1420 WMIC.exe Token: SeSystemtimePrivilege 1420 WMIC.exe Token: SeProfSingleProcessPrivilege 1420 WMIC.exe Token: SeIncBasePriorityPrivilege 1420 WMIC.exe Token: SeCreatePagefilePrivilege 1420 WMIC.exe Token: SeBackupPrivilege 1420 WMIC.exe Token: SeRestorePrivilege 1420 WMIC.exe Token: SeShutdownPrivilege 1420 WMIC.exe Token: SeDebugPrivilege 1420 WMIC.exe Token: SeSystemEnvironmentPrivilege 1420 WMIC.exe Token: SeRemoteShutdownPrivilege 1420 WMIC.exe Token: SeUndockPrivilege 1420 WMIC.exe Token: SeManageVolumePrivilege 1420 WMIC.exe Token: 33 1420 WMIC.exe Token: 34 1420 WMIC.exe Token: 35 1420 WMIC.exe Token: SeBackupPrivilege 2232 wbengine.exe Token: SeRestorePrivilege 2232 wbengine.exe Token: SeSecurityPrivilege 2232 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 1740 wrote to memory of 2800 1740 FreeVbucks.exe 30 PID 1740 wrote to memory of 2800 1740 FreeVbucks.exe 30 PID 1740 wrote to memory of 2800 1740 FreeVbucks.exe 30 PID 2800 wrote to memory of 1280 2800 svchost.exe 31 PID 2800 wrote to memory of 1280 2800 svchost.exe 31 PID 2800 wrote to memory of 1280 2800 svchost.exe 31 PID 1280 wrote to memory of 2136 1280 cmd.exe 33 PID 1280 wrote to memory of 2136 1280 cmd.exe 33 PID 1280 wrote to memory of 2136 1280 cmd.exe 33 PID 1280 wrote to memory of 1420 1280 cmd.exe 37 PID 1280 wrote to memory of 1420 1280 cmd.exe 37 PID 1280 wrote to memory of 1420 1280 cmd.exe 37 PID 2800 wrote to memory of 1124 2800 svchost.exe 39 PID 2800 wrote to memory of 1124 2800 svchost.exe 39 PID 2800 wrote to memory of 1124 2800 svchost.exe 39 PID 1124 wrote to memory of 2096 1124 cmd.exe 41 PID 1124 wrote to memory of 2096 1124 cmd.exe 41 PID 1124 wrote to memory of 2096 1124 cmd.exe 41 PID 1124 wrote to memory of 2212 1124 cmd.exe 42 PID 1124 wrote to memory of 2212 1124 cmd.exe 42 PID 1124 wrote to memory of 2212 1124 cmd.exe 42 PID 2800 wrote to memory of 2416 2800 svchost.exe 43 PID 2800 wrote to memory of 2416 2800 svchost.exe 43 PID 2800 wrote to memory of 2416 2800 svchost.exe 43 PID 2416 wrote to memory of 2160 2416 cmd.exe 45 PID 2416 wrote to memory of 2160 2416 cmd.exe 45 PID 2416 wrote to memory of 2160 2416 cmd.exe 45 PID 2800 wrote to memory of 1584 2800 svchost.exe 49 PID 2800 wrote to memory of 1584 2800 svchost.exe 49 PID 2800 wrote to memory of 1584 2800 svchost.exe 49 -
Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
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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\FreeVbucks.exe"C:\Users\Admin\AppData\Local\Temp\FreeVbucks.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1740 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"2⤵
- Drops startup file
- Executes dropped EXE
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2800 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:1280 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2136
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:1420
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no3⤵
- Suspicious use of WriteProcessMemory
PID:1124 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2096
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:2212
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2416 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:2160
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt3⤵
- Opens file in notepad (likely ransom note)
PID:1584
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2260
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2232
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2084
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:448
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
2.7MB
MD5afba56cb6fee3660b751b98418c1fdf1
SHA124364e0e691df3b6e7ebd0e142993fcd6b063984
SHA256df86bc46fdd921147c26c94a4cc054efa01bf2fa837756ffc0139171c8a388d8
SHA512dd138767c127af7e92a696ceccc3b304c99a52392c66d6e8af41f68be8165af55c99ccc62546afbec2da212f207e9b0a66968e73eaab4d3f2821172ff1d3a99b
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Filesize
964B
MD54217b8b83ce3c3f70029a056546f8fd0
SHA1487cdb5733d073a0427418888e8f7070fe782a03
SHA2567d767e907be373c680d1f7884d779588eb643bebb3f27bf3b5ed4864aa4d8121
SHA5122a58c99fa52f99c276e27eb98aef2ce1205f16d1e37b7e87eb69e9ecda22b578195a43f1a7f70fead6ba70421abf2f85c917551c191536eaf1f3011d3d24f740