Analysis
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max time kernel
134s -
max time network
146s -
platform
windows10-2004_x64 -
resource
win10v2004-20231215-en -
resource tags
arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system -
submitted
28/01/2024, 23:31
Behavioral task
behavioral1
Sample
66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe
Resource
win7-20231215-en
Behavioral task
behavioral2
Sample
66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe
Resource
win10v2004-20231215-en
General
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Target
66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe
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Size
26KB
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MD5
f7a4f6aa90509768c05391638001d8ec
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SHA1
e9d7d58151543804c1cf1348c97b6a04b5ea3bb1
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SHA256
8168216e4db26c5971cd1d7d2ab38a4b2e10f217a02053271ecf838c4a8f608a
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SHA512
c3ef97b36b1dbfef0340bb573d2f1bdb8f009120be23cd297a425c605c63f2db39f2a3e50634f01054edb2931dd6a148a36ad67eaa89158668d8603bc11442a3
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SSDEEP
384:qYenjLLAps4T5lBavzb/xlhKOVp91Qxb5hxDGt:5OElB6sc9GxbXxDy
Malware Config
Extracted
C:\Users\Admin\3D Objects\read_it.txt
chaos
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 2 IoCs
resource yara_rule behavioral2/memory/3548-0-0x0000000000240000-0x000000000024C000-memory.dmp family_chaos behavioral2/files/0x0006000000023125-6.dat family_chaos -
Detects command variations typically used by ransomware 2 IoCs
resource yara_rule behavioral2/memory/3548-0-0x0000000000240000-0x000000000024C000-memory.dmp INDICATOR_SUSPICIOUS_GENRansomware behavioral2/files/0x0006000000023125-6.dat INDICATOR_SUSPICIOUS_GENRansomware -
Renames multiple (166) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation svchost.exe Key value queried \REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.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 1044 svchost.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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Drops desktop.ini file(s) 64 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Burn\Burn\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Local\Microsoft\Windows\WinX\Group2\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\WinX\Group1\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\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\StartUp\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\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\All Users\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3073191680-435865314-2862784915-1000\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\WinX\Group3\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\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\Admin\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessibility\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\All Users\Microsoft\Windows\Start Menu\Programs\System Tools\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\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\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\Default\AppData\Local\Microsoft\Windows\WinX\Group1\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\Public\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\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\Public\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\Burn\Burn1\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Burn\Burn2\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\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\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\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Saved Pictures\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\Admin\AppData\Local\Microsoft\Windows\WinX\Group2\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\Maintenance\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\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\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\Admin\AppData\Local\Microsoft\Windows\Application Shortcuts\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\Admin\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Camera Roll\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\Admin\OneDrive\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\desktop.ini svchost.exe File opened for modification C:\Users\Admin\3D Objects\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\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Windows PowerShell\desktop.ini svchost.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000_Classes\Local Settings svchost.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 3808 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 1044 svchost.exe -
Suspicious behavior: EnumeratesProcesses 49 IoCs
pid Process 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe 1044 svchost.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe Token: SeDebugPrivilege 1044 svchost.exe -
Suspicious use of WriteProcessMemory 4 IoCs
description pid Process procid_target PID 3548 wrote to memory of 1044 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 84 PID 3548 wrote to memory of 1044 3548 66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe 84 PID 1044 wrote to memory of 3808 1044 svchost.exe 90 PID 1044 wrote to memory of 3808 1044 svchost.exe 90
Processes
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C:\Users\Admin\AppData\Local\Temp\66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe"C:\Users\Admin\AppData\Local\Temp\66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3548 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"2⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Drops desktop.ini file(s)
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1044 -
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:3808
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
964B
MD54217b8b83ce3c3f70029a056546f8fd0
SHA1487cdb5733d073a0427418888e8f7070fe782a03
SHA2567d767e907be373c680d1f7884d779588eb643bebb3f27bf3b5ed4864aa4d8121
SHA5122a58c99fa52f99c276e27eb98aef2ce1205f16d1e37b7e87eb69e9ecda22b578195a43f1a7f70fead6ba70421abf2f85c917551c191536eaf1f3011d3d24f740
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C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\66f4c72aac78d1a3f50e2269496526a3739e3db15f518ad7843c4faecd5c6e0a.exe.log
Filesize226B
MD528d7fcc2b910da5e67ebb99451a5f598
SHA1a5bf77a53eda1208f4f37d09d82da0b9915a6747
SHA2562391511d0a66ed9f84ae54254f51c09e43be01ad685db80da3201ec880abd49c
SHA5122d8eb65cbf04ca506f4ef3b9ae13ccf05ebefab702269ba70ffd1ce9e6c615db0a3ee3ac0e81a06f546fc3250b7b76155dd51241c41b507a441b658c8e761df6
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0
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Filesize
26KB
MD5f7a4f6aa90509768c05391638001d8ec
SHA1e9d7d58151543804c1cf1348c97b6a04b5ea3bb1
SHA2568168216e4db26c5971cd1d7d2ab38a4b2e10f217a02053271ecf838c4a8f608a
SHA512c3ef97b36b1dbfef0340bb573d2f1bdb8f009120be23cd297a425c605c63f2db39f2a3e50634f01054edb2931dd6a148a36ad67eaa89158668d8603bc11442a3