Analysis
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max time kernel
121s -
max time network
122s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
08-01-2025 00:34
Behavioral task
behavioral1
Sample
SigmaBoy.exe
Resource
win7-20240903-en
windows7-x64
23 signatures
150 seconds
Behavioral task
behavioral2
Sample
SigmaBoy.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
26 signatures
150 seconds
General
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Target
SigmaBoy.exe
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Size
54KB
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MD5
581ee9647cd1e172a842994422821ae5
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SHA1
2cf3dea7e729c52bc1e4ac79cb99e1716930829a
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SHA256
cef3874fb20c6b330fa55e74ce88434bbd849e229974663bed77e6ba18253276
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SHA512
10d5924d47c033e59ce67fad60d83a1c37af8be52b2da632f129c1b6f2108d749d65e5d996cf3205e5e8a966aa0e5089dd5c0d0695c8b082a7ee255a955a8851
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SSDEEP
768:87zxAmnV2D+kRho9IzFuHJbfslnjo/qAZYMGvZM2ACyFD0iM6wteI82j:8NA+kRq9IcHX/NYMGvZFA3FD0T2e
Malware Config
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/2316-1-0x0000000001380000-0x0000000001394000-memory.dmp family_chaos behavioral1/files/0x0008000000012117-6.dat family_chaos behavioral1/memory/3008-8-0x0000000000890000-0x00000000008A4000-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 2956 bcdedit.exe 484 bcdedit.exe -
Renames multiple (184) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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pid Process 2896 wbadmin.exe -
Disables Task Manager via registry modification
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Drops startup file 2 IoCs
description ioc Process 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 3008 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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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\Run\UpdateTask = "C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe" svchost.exe -
Drops desktop.ini file(s) 64 IoCs
description ioc Process 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\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\UGWF8QWZ\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\AQYH36ZT\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\T1DP8V76\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Ringtones\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\desktop.ini svchost.exe File opened for modification C:\Users\Public\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\U3EGUGI8\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\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\Admin\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\BY17T927\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini svchost.exe File opened for modification C:\Users\Public\Recorded TV\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\MT4W94IX\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Tablet PC\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\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Public\Recorded TV\Sample Media\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows Mail\Stationery\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Public\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Public\Libraries\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\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Games\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\Videos\Sample Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\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\Public\Videos\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\Windows\Libraries\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\SendTo\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\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3063565911-2056067323-3330884624-1000\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\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\Local\Microsoft\Feeds Cache\QMPQWRBT\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\39RANI6K\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\rr4wmpq5m.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 2616 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 2784 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 2316 SigmaBoy.exe 3008 svchost.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 2316 SigmaBoy.exe 2316 SigmaBoy.exe 2316 SigmaBoy.exe 3008 svchost.exe 3008 svchost.exe 3008 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2316 SigmaBoy.exe Token: SeDebugPrivilege 3008 svchost.exe Token: SeBackupPrivilege 2576 vssvc.exe Token: SeRestorePrivilege 2576 vssvc.exe Token: SeAuditPrivilege 2576 vssvc.exe Token: SeIncreaseQuotaPrivilege 376 WMIC.exe Token: SeSecurityPrivilege 376 WMIC.exe Token: SeTakeOwnershipPrivilege 376 WMIC.exe Token: SeLoadDriverPrivilege 376 WMIC.exe Token: SeSystemProfilePrivilege 376 WMIC.exe Token: SeSystemtimePrivilege 376 WMIC.exe Token: SeProfSingleProcessPrivilege 376 WMIC.exe Token: SeIncBasePriorityPrivilege 376 WMIC.exe Token: SeCreatePagefilePrivilege 376 WMIC.exe Token: SeBackupPrivilege 376 WMIC.exe Token: SeRestorePrivilege 376 WMIC.exe Token: SeShutdownPrivilege 376 WMIC.exe Token: SeDebugPrivilege 376 WMIC.exe Token: SeSystemEnvironmentPrivilege 376 WMIC.exe Token: SeRemoteShutdownPrivilege 376 WMIC.exe Token: SeUndockPrivilege 376 WMIC.exe Token: SeManageVolumePrivilege 376 WMIC.exe Token: 33 376 WMIC.exe Token: 34 376 WMIC.exe Token: 35 376 WMIC.exe Token: SeIncreaseQuotaPrivilege 376 WMIC.exe Token: SeSecurityPrivilege 376 WMIC.exe Token: SeTakeOwnershipPrivilege 376 WMIC.exe Token: SeLoadDriverPrivilege 376 WMIC.exe Token: SeSystemProfilePrivilege 376 WMIC.exe Token: SeSystemtimePrivilege 376 WMIC.exe Token: SeProfSingleProcessPrivilege 376 WMIC.exe Token: SeIncBasePriorityPrivilege 376 WMIC.exe Token: SeCreatePagefilePrivilege 376 WMIC.exe Token: SeBackupPrivilege 376 WMIC.exe Token: SeRestorePrivilege 376 WMIC.exe Token: SeShutdownPrivilege 376 WMIC.exe Token: SeDebugPrivilege 376 WMIC.exe Token: SeSystemEnvironmentPrivilege 376 WMIC.exe Token: SeRemoteShutdownPrivilege 376 WMIC.exe Token: SeUndockPrivilege 376 WMIC.exe Token: SeManageVolumePrivilege 376 WMIC.exe Token: 33 376 WMIC.exe Token: 34 376 WMIC.exe Token: 35 376 WMIC.exe Token: SeBackupPrivilege 1208 wbengine.exe Token: SeRestorePrivilege 1208 wbengine.exe Token: SeSecurityPrivilege 1208 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 2316 wrote to memory of 3008 2316 SigmaBoy.exe 30 PID 2316 wrote to memory of 3008 2316 SigmaBoy.exe 30 PID 2316 wrote to memory of 3008 2316 SigmaBoy.exe 30 PID 3008 wrote to memory of 2932 3008 svchost.exe 31 PID 3008 wrote to memory of 2932 3008 svchost.exe 31 PID 3008 wrote to memory of 2932 3008 svchost.exe 31 PID 2932 wrote to memory of 2616 2932 cmd.exe 33 PID 2932 wrote to memory of 2616 2932 cmd.exe 33 PID 2932 wrote to memory of 2616 2932 cmd.exe 33 PID 2932 wrote to memory of 376 2932 cmd.exe 36 PID 2932 wrote to memory of 376 2932 cmd.exe 36 PID 2932 wrote to memory of 376 2932 cmd.exe 36 PID 3008 wrote to memory of 2760 3008 svchost.exe 38 PID 3008 wrote to memory of 2760 3008 svchost.exe 38 PID 3008 wrote to memory of 2760 3008 svchost.exe 38 PID 2760 wrote to memory of 2956 2760 cmd.exe 40 PID 2760 wrote to memory of 2956 2760 cmd.exe 40 PID 2760 wrote to memory of 2956 2760 cmd.exe 40 PID 2760 wrote to memory of 484 2760 cmd.exe 41 PID 2760 wrote to memory of 484 2760 cmd.exe 41 PID 2760 wrote to memory of 484 2760 cmd.exe 41 PID 3008 wrote to memory of 2784 3008 svchost.exe 42 PID 3008 wrote to memory of 2784 3008 svchost.exe 42 PID 3008 wrote to memory of 2784 3008 svchost.exe 42 PID 2784 wrote to memory of 2896 2784 cmd.exe 44 PID 2784 wrote to memory of 2896 2784 cmd.exe 44 PID 2784 wrote to memory of 2896 2784 cmd.exe 44 PID 3008 wrote to memory of 2784 3008 svchost.exe 49 PID 3008 wrote to memory of 2784 3008 svchost.exe 49 PID 3008 wrote to memory of 2784 3008 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\SigmaBoy.exe"C:\Users\Admin\AppData\Local\Temp\SigmaBoy.exe"1⤵
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2316 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"2⤵
- Drops startup file
- Executes dropped EXE
- Adds Run key to start application
- 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:3008 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2932 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2616
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:376
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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:2760 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2956
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:484
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2784 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:2896
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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:2784
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2576
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1208
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:1268
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:2216
Network
MITRE ATT&CK Enterprise v15
Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Defense Evasion
Direct Volume Access
1Indicator Removal
3File Deletion
3Modify Registry
2Replay Monitor
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Downloads
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Filesize
544B
MD513590b713cfffb669d620b83c155fe15
SHA16df2029201f0f0a1287ed88be00e7b77078c4ead
SHA25613cf139a531ef1a4f93b36d4cf4087f4e801339b79b5958e2b527571b03977ed
SHA512ca4823449ae207ac19e774553375d5d285061e8b2aff751e6172be35c8d66437582ec76bb1324117ed770ab0a0b374e7edbfe607540abf38e2164f61dea79a6c
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Filesize
54KB
MD5581ee9647cd1e172a842994422821ae5
SHA12cf3dea7e729c52bc1e4ac79cb99e1716930829a
SHA256cef3874fb20c6b330fa55e74ce88434bbd849e229974663bed77e6ba18253276
SHA51210d5924d47c033e59ce67fad60d83a1c37af8be52b2da632f129c1b6f2108d749d65e5d996cf3205e5e8a966aa0e5089dd5c0d0695c8b082a7ee255a955a8851
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0