Analysis
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max time kernel
142s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
30-11-2024 21:32
General
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Target
kyhjasehs.exe
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Size
1.8MB
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MD5
4f964ada28fa2dde5c75d3c3682e69c4
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SHA1
481a0ddc3dfd39147abf684b60b6a0b1dfbbc341
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SHA256
7b0699fb946ce952624a3d5807839fb1a0613993270aca8227f35001b790b945
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SHA512
ab07c9602776dc062599a89eed9d38be2c95f563a9ed9c906e6c1066f80e5666f119c5a790a120bf626a73edd3cc178924262d41c0f65eb20fcf3b542a83dc68
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SSDEEP
24576:cWrCg/r+6/5OZr1A+KnhQaPNcHxIpjgqJ6t1:XrC7G5g0gq
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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Modifies WinLogon for persistence 2 TTPs 1 IoCs
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Process spawned unexpected child process 3 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
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DCRat payload 2 IoCs
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE 1 IoCs
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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 2 IoCs
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Drops file in System32 directory 2 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Modifies registry class 1 IoCs
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Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious behavior: EnumeratesProcesses 64 IoCs
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Suspicious behavior: GetForegroundWindowSpam 1 IoCs
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Suspicious use of AdjustPrivilegeToken 2 IoCs
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Suspicious use of WriteProcessMemory 12 IoCs
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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\kyhjasehs.exe"C:\Users\Admin\AppData\Local\Temp\kyhjasehs.exe"1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\lbxpr5j2\lbxpr5j2.cmdline"2⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
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C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exeC:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESBB12.tmp" "c:\Windows\System32\CSC5FA4CC3E6CA3418280B5F8D1238C5937.TMP"3⤵
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\IB96Syu3ap.bat"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\chcp.comchcp 650013⤵
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C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:23⤵
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C:\Users\Admin\AppData\Local\updater.exe"C:\Users\Admin\AppData\Local\updater.exe"3⤵
- Executes dropped EXE
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "updateru" /sc MINUTE /mo 6 /tr "'C:\Users\Admin\AppData\Local\updater.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "updater" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\updater.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "updateru" /sc MINUTE /mo 8 /tr "'C:\Users\Admin\AppData\Local\updater.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
216B
MD5e2d5db61e767143b2d2d5d7078d4fba8
SHA16dea85e8468749f659af5854cc3a9b7f025621f0
SHA256f216a9d9f00c875c82671b126202bd1db8bdb26a5c4e536387deaa82fa7ea081
SHA51240d4aafe8516b869cee3b59138bc1023fcd8ee74b29a6960009495a17d425348e1da3a380623b1d1d681f7ccbb8025057a4cfe2703e759e74eb36742b1b2af0e
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Filesize
1KB
MD5221be298aaf2caaff8297766a5e763b6
SHA1e883728b8455018bfd98aff25d3c2b71042e027f
SHA256f332c99c4cfb02f17f2d2d874c7403e9c2f6f6cfaeffd0ceef2d8042cd73d10e
SHA5125f926eee789e4e0b4984e33ffa4384197be94ec91601501871d9878a9b93b48dd2b2ada161c22f6297f704fa32bae9a10beba5fdaede8ff8df10ba95cd49e7f2
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Filesize
1.8MB
MD54f964ada28fa2dde5c75d3c3682e69c4
SHA1481a0ddc3dfd39147abf684b60b6a0b1dfbbc341
SHA2567b0699fb946ce952624a3d5807839fb1a0613993270aca8227f35001b790b945
SHA512ab07c9602776dc062599a89eed9d38be2c95f563a9ed9c906e6c1066f80e5666f119c5a790a120bf626a73edd3cc178924262d41c0f65eb20fcf3b542a83dc68
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Filesize
372B
MD5ea9c610e7f722c65aced40586dfceec3
SHA1b87002b5b5035c81b158e7bbca0b28549275d292
SHA25679f0855c40daa3741a2f3e5b83856c78f27de675a73e4f73906b160f06d81980
SHA51201374815dca48c396e5b17eb25d9535e510a204678aeb019d34190ba0713989a9dd0581b6322ab43a6dcb480a2d16898490a6a320e82ba773d3e56a738786adc
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Filesize
235B
MD56f0104f4099b3aed49a4903091824e4e
SHA16663b2b07ecb022684582fec5b852f5bcfeee20d
SHA2561f6aea3387dd6c62af0225a296f426df99445243b3e1b97f9ad26ec03559c829
SHA5120e1564af1a2d5ef6ab27fb0a8d30108b4629bfefeb25c5468952a7c44ec534144d20b08f6fceaceb1eda2c0d04f292340dc3e4e019ec282823c8f89850c34a57
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Filesize
1KB
MD52fd2b90e7053b01e6af25701a467eb1f
SHA168801a13cebba82c24f67a9d7c886fcefcf01a51
SHA25612b900db56a20f01f0f1d65f46933971415d5b5675e59e8b02b3dae12aaa1527
SHA512081d3a621e3664709867f3fdd82808364978f896fb007c0c8e6c8dfe25f2f2b8d37c9e0b2e4fb51c90bc6f691507b569e5d841ef3ca3bd38bd6adda2d30f32af
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Filesize
1.3MB
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Filesize
64KB
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Filesize
312KB
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Filesize
56KB
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Filesize
72KB
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Filesize
88KB
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Filesize
56KB
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Filesize
10.8MB
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Filesize
8KB
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Filesize
360KB
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Filesize
10.8MB
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Filesize
56KB
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Filesize
112KB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
96KB
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Filesize
320KB
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Filesize
112KB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
56KB
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Filesize
10.8MB
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Filesize
1.8MB