Analysis
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max time kernel
134s -
max time network
139s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
31-10-2024 20:23
Behavioral task
behavioral1
Sample
{VKK+KODS}/Vkk.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
{VKK+KODS}/Vkk.exe
Resource
win10v2004-20241007-en
Behavioral task
behavioral3
Sample
{VKK+KODS}/vkk.exe
Resource
win7-20241023-en
Behavioral task
behavioral4
Sample
{VKK+KODS}/vkk.exe
Resource
win10v2004-20241007-en
General
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Target
{VKK+KODS}/vkk.exe
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Size
653KB
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MD5
91bd6c254ee87e5c67ec306277cd4aaa
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SHA1
a7c343316582f0bbd25f23c6a082d0061f0e560b
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SHA256
878683a67bb95a2a2917b57b9a737ae1f085fcb8950b212c3a28884abf9c1a34
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SHA512
1159b53efc6bc16376504f87e4717ad630b094b3f33ae135409f27296ff2e2fc2e9f9aa21908c2789b7b094deafdbb247925a3691cb1a5bd1fc3a87fda9a7824
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SSDEEP
12288:nRZ+IoG/n9IQxW3OBsegHibt32N7oqcLCf8VI3WYwSTdxjZQ:P2G/nvxW3Wu0t32VCk3WY1xju
Malware Config
Signatures
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DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
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Dcrat family
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Process spawned unexpected child process 30 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
description pid pid_target Process procid_target Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3224 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 392 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1108 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3004 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4688 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2140 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4148 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 900 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4792 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3904 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2564 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1948 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1040 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2620 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 5096 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2360 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2560 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4584 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3520 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4548 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3940 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3172 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3604 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2912 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4856 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 748 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4556 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4188 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4788 3924 schtasks.exe 92 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2656 3924 schtasks.exe 92 -
resource yara_rule behavioral4/files/0x0007000000023ca1-9.dat dcrat behavioral4/memory/2668-13-0x0000000000200000-0x0000000000256000-memory.dmp dcrat -
Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation vkk.exe Key value queried \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation WScript.exe Key value queried \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation BridgeMsDll.exe -
Executes dropped EXE 2 IoCs
pid Process 2668 BridgeMsDll.exe 2896 sihost.exe -
Drops file in Program Files directory 6 IoCs
description ioc Process File created C:\Program Files\Windows Security\sihost.exe BridgeMsDll.exe File created C:\Program Files\Windows Security\66fc9ff0ee96c2 BridgeMsDll.exe File created C:\Program Files\Internet Explorer\SIGNUP\winlogon.exe BridgeMsDll.exe File created C:\Program Files\Internet Explorer\SIGNUP\cc11b995f2a76d BridgeMsDll.exe File created C:\Program Files\Mozilla Firefox\cmd.exe BridgeMsDll.exe File created C:\Program Files\Mozilla Firefox\ebf1f9fa8afd6d BridgeMsDll.exe -
Drops file in Windows directory 5 IoCs
description ioc Process File created C:\Windows\ModemLogs\RuntimeBroker.exe BridgeMsDll.exe File opened for modification C:\Windows\ModemLogs\RuntimeBroker.exe BridgeMsDll.exe File created C:\Windows\ModemLogs\9e8d7a4ca61bd9 BridgeMsDll.exe File created C:\Windows\Performance\fontdrvhost.exe BridgeMsDll.exe File created C:\Windows\Performance\5b884080fd4f94 BridgeMsDll.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 3 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 vkk.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language WScript.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language cmd.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000_Classes\Local Settings vkk.exe -
Scheduled Task/Job: Scheduled Task 1 TTPs 30 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 3004 schtasks.exe 2564 schtasks.exe 4548 schtasks.exe 2912 schtasks.exe 4688 schtasks.exe 900 schtasks.exe 3904 schtasks.exe 4856 schtasks.exe 2656 schtasks.exe 1948 schtasks.exe 2620 schtasks.exe 2360 schtasks.exe 1108 schtasks.exe 4148 schtasks.exe 2560 schtasks.exe 3520 schtasks.exe 2140 schtasks.exe 4792 schtasks.exe 4584 schtasks.exe 3172 schtasks.exe 4556 schtasks.exe 4788 schtasks.exe 3940 schtasks.exe 748 schtasks.exe 4188 schtasks.exe 3224 schtasks.exe 392 schtasks.exe 1040 schtasks.exe 5096 schtasks.exe 3604 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 11 IoCs
pid Process 2668 BridgeMsDll.exe 2668 BridgeMsDll.exe 2668 BridgeMsDll.exe 2668 BridgeMsDll.exe 2668 BridgeMsDll.exe 2668 BridgeMsDll.exe 2668 BridgeMsDll.exe 2668 BridgeMsDll.exe 2668 BridgeMsDll.exe 2668 BridgeMsDll.exe 2896 sihost.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2668 BridgeMsDll.exe Token: SeDebugPrivilege 2896 sihost.exe -
Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 2404 wrote to memory of 1044 2404 vkk.exe 85 PID 2404 wrote to memory of 1044 2404 vkk.exe 85 PID 2404 wrote to memory of 1044 2404 vkk.exe 85 PID 1044 wrote to memory of 1016 1044 WScript.exe 93 PID 1044 wrote to memory of 1016 1044 WScript.exe 93 PID 1044 wrote to memory of 1016 1044 WScript.exe 93 PID 1016 wrote to memory of 2668 1016 cmd.exe 95 PID 1016 wrote to memory of 2668 1016 cmd.exe 95 PID 2668 wrote to memory of 2896 2668 BridgeMsDll.exe 127 PID 2668 wrote to memory of 2896 2668 BridgeMsDll.exe 127 -
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.
Processes
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C:\Users\Admin\AppData\Local\Temp\{VKK+KODS}\vkk.exe"C:\Users\Admin\AppData\Local\Temp\{VKK+KODS}\vkk.exe"1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2404 -
C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\Combrowser\Fcaxb7I9ITZe2hUWU.vbe"2⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1044 -
C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Combrowser\10l79m1i778n.bat" "3⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1016 -
C:\Combrowser\BridgeMsDll.exe"C:\Combrowser\BridgeMsDll.exe"4⤵
- Checks computer location settings
- Executes dropped EXE
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2668 -
C:\Users\All Users\regid.1991-06.com.microsoft\sihost.exe"C:\Users\All Users\regid.1991-06.com.microsoft\sihost.exe"5⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2896
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Windows\ModemLogs\RuntimeBroker.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3224
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\ModemLogs\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:392
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 9 /tr "'C:\Windows\ModemLogs\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1108
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 6 /tr "'C:\Users\Default User\SearchApp.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3004
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Users\Default User\SearchApp.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4688
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 13 /tr "'C:\Users\Default User\SearchApp.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2140
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Program Files\Windows Security\sihost.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4148
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files\Windows Security\sihost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:900
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihosts" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Security\sihost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4792
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihosts" /sc MINUTE /mo 7 /tr "'C:\Users\All Users\regid.1991-06.com.microsoft\sihost.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3904
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Users\All Users\regid.1991-06.com.microsoft\sihost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2564
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihosts" /sc MINUTE /mo 12 /tr "'C:\Users\All Users\regid.1991-06.com.microsoft\sihost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1948
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 14 /tr "'C:\Program Files\Internet Explorer\SIGNUP\winlogon.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1040
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files\Internet Explorer\SIGNUP\winlogon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2620
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 13 /tr "'C:\Program Files\Internet Explorer\SIGNUP\winlogon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5096
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 8 /tr "'C:\Windows\Performance\fontdrvhost.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2360
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\Performance\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2560
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 12 /tr "'C:\Windows\Performance\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4584
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmdc" /sc MINUTE /mo 6 /tr "'C:\Combrowser\cmd.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3520
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Combrowser\cmd.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4548
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmdc" /sc MINUTE /mo 13 /tr "'C:\Combrowser\cmd.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3940
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3172
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3604
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2912
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmdc" /sc MINUTE /mo 8 /tr "'C:\Program Files\Mozilla Firefox\cmd.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4856
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Program Files\Mozilla Firefox\cmd.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:748
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmdc" /sc MINUTE /mo 14 /tr "'C:\Program Files\Mozilla Firefox\cmd.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4556
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 7 /tr "'C:\Combrowser\RuntimeBroker.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4188
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Combrowser\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4788
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Combrowser\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2656
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
31B
MD5e229e6475655dbf48debe39ea7e4c0d0
SHA1835a9dc7bd837e6096df8d97dff90ab88e656a41
SHA2560ef204e2c7f3c6d5ace003c6864db74cc2f085543409a3366af99a5f45823933
SHA5126aa3ae4bf881de134b54ca4e5f813ed380645091a51762046b41d47e56318a3970a5b4158d302fc887e0ccff41304050364acde8fcf0e126721e0eea1bc42b27
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Filesize
315KB
MD557566762e7d37fdeae9c4740f16f1b75
SHA1e6d5a1055d1064569977dc54f5ba162348e2bebb
SHA256ea420c16fb24ec295eca3c796d735a758bdc00071d233ff73ee841d56b4b004a
SHA5120d94f11242de7f01804e9e35fd5f422be6bcc62a292d900aa708b01c74472e2bee20dfc682786c88dd26d97614d00b2fc5106b7557d4eff090487ca7032f8783
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Filesize
199B
MD575cec359961d378447f24b18efadc0c5
SHA19fec81fc93c8d8b17a4070057ec8e68da824c14d
SHA256cb4216925fc61c39e18644995303fc6b6eedd4154ce6b10a6e42a71db8170101
SHA5121f0f57c0a11485c656c49d8b897e101660775e8cd7c35c2cb302dabc9bd9024bfd173d7a938f733b12d30636715238325ea6fa4955e344822c512ff4ab030597