Analysis
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max time kernel
95s -
max time network
139s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
07-11-2024 19:10
General
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Target
f7d1ba849bec5c9f1761a6b420f793fa7c350be0e66d40788cde74650bf8a20b.exe
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Size
952KB
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MD5
2e9644402e12601f1d8161857c48a3ad
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SHA1
43b55976d438bc8273932f12a12b7f248165e8a9
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SHA256
f7d1ba849bec5c9f1761a6b420f793fa7c350be0e66d40788cde74650bf8a20b
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SHA512
4e1efd2ef2a9e9f062c3a9321cb28c34a56edc9b398e857eb3f14ecc6ded5660249a4523b8c21eccf3db524625b05ab1b075d7be20f68d0e27f91e7b403a1662
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SSDEEP
24576:Q+O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXX:z8/KfRTK
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 7 IoCs
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Process spawned unexpected child process 7 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
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UAC bypass 3 TTPs 3 IoCs
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DCRat payload 5 IoCs
Detects payload of DCRat, commonly dropped by NSIS installers.
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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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Adds Run key to start application 2 TTPs 14 IoCs
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Checks whether UAC is enabled 1 TTPs 2 IoCs
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Drops file in System32 directory 15 IoCs
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Drops file in Windows directory 10 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Scheduled Task/Job: Scheduled Task 1 TTPs 7 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious behavior: EnumeratesProcesses 8 IoCs
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Suspicious use of AdjustPrivilegeToken 1 IoCs
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System policy modification 1 TTPs 3 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\f7d1ba849bec5c9f1761a6b420f793fa7c350be0e66d40788cde74650bf8a20b.exe"C:\Users\Admin\AppData\Local\Temp\f7d1ba849bec5c9f1761a6b420f793fa7c350be0e66d40788cde74650bf8a20b.exe"1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Checks computer location settings
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- System policy modification
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\tracing\services.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 "TextInputHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\TextInputCommon\TextInputHost.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 "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\StartMenuExperienceHost.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 "sihost" /sc ONLOGON /tr "'C:\Windows\System32\UevAppMonitor\sihost.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 "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\cflapi\dllhost.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 "backgroundTaskHost" /sc ONLOGON /tr "'C:\Documents and Settings\backgroundTaskHost.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 "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\mdmregistration\backgroundTaskHost.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
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot 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
952KB
MD581f62c3f346312bad632dcbfb84d3137
SHA1453a0f09bfcc83e583403e6613bf9a724256f09d
SHA256926ee7b3ce9e966bd2a0aa341f3f877f2ea2a356a4a48c4af26700cb75f00c99
SHA512420730ca19057640d3829aa1cf3c4839e60a47bdcef2a4728476767c017d5d69841c2ebc8a061bbf6fdd433db6374a16c7d40aa7e0487df94bf5f2650d4d763c
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Filesize
952KB
MD50e8332028cbcd666a336279ca90d23f8
SHA11e9cf9a8ed4071157357bb822bf35ca3f3386397
SHA2565eec7df988c28c5efd931dca389a3e9a32096cff3292b639d30802b6dbff94b8
SHA512ddfe71616128e2d02797362eeb79e082fde81ab76e253d08cadc6bba7d0655a8813ca37cbde33f4f0be22f22527dd26b2a52a2d49fa912a767caf1939d093fe0
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Filesize
952KB
MD52e9644402e12601f1d8161857c48a3ad
SHA143b55976d438bc8273932f12a12b7f248165e8a9
SHA256f7d1ba849bec5c9f1761a6b420f793fa7c350be0e66d40788cde74650bf8a20b
SHA5124e1efd2ef2a9e9f062c3a9321cb28c34a56edc9b398e857eb3f14ecc6ded5660249a4523b8c21eccf3db524625b05ab1b075d7be20f68d0e27f91e7b403a1662
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Filesize
952KB
MD591d3a24b67e5195aa7403cd6d0643b63
SHA1bf2b9b5fc40b63e4587c07091311e1b0c198d2f8
SHA2560ca47786840e395b95fda5b7e9cbb44caea47b979e9edff923114f04e52c029a
SHA512491f1858f00cd8969214de41c687d18b38e318bbbdc1af930207feafa7e76b5b20b6183847331c096c71b8b34e713889124aa73cdd79ab7be9c3661377c598e8
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Filesize
64KB
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Filesize
40KB
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Filesize
48KB
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Filesize
40KB
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Filesize
48KB
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Filesize
40KB
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Filesize
48KB
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Filesize
32KB
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Filesize
8KB
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Filesize
64KB
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Filesize
10.8MB
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Filesize
976KB
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Filesize
10.8MB