Analysis
- max time kernel
116s - max time network
155s - platform
windows10_x64 - resource
win10v20210410 - submitted
15/06/2021, 21:27
General
- Target 048AC151CE97E95A980399E849DAAE95.exe
- Size 428KB
- Sample210615-ctcry3nmva
- SHA256 f896c6618235d320b62e6662673830cbd21d7be057b356eef83aac8f21684b6f
Malware Config
Signatures
- DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
- DCRat Payload 2 IoCs
Detects payload of DCRat, commonly dropped by NSIS installers.
- Executes dropped EXE 1 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Drops file in System32 directory 5 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Creates scheduled task(s) 1 TTPs 4 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 3 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 10 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\048AC151CE97E95A980399E849DAAE95.exe"C:\Users\Admin\AppData\Local\Temp\048AC151CE97E95A980399E849DAAE95.exe"1⤵
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\DataUsageHandlers\dwm.exe'" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Documents and Settings\WmiPrvSE.exe'" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\KeywordDetectorMsftSidAdapter\winlogon.exe'" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\PerfLogs\fontdrvhost.exe'" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
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C:\Windows\System32\DataUsageHandlers\dwm.exe"C:\Windows\System32\DataUsageHandlers\dwm.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
memory/3380-128-0x00000161CC9F0000-0x00000161CC9F1000-memory.dmp
memory/3380-126-0x00000161CB180000-0x00000161CB182000-memory.dmp
memory/3380-127-0x00000161CB1E0000-0x00000161CB1E7000-memory.dmp
memory/3380-129-0x00000161CCA10000-0x00000161CCA15000-memory.dmp
memory/3380-130-0x00000161CC9D0000-0x00000161CC9D2000-memory.dmp
memory/3380-131-0x00000161CC9E0000-0x00000161CC9E2000-memory.dmp
memory/3380-132-0x00000161E5750000-0x00000161E5751000-memory.dmp
memory/3380-133-0x00000161E6050000-0x00000161E6051000-memory.dmp
memory/3744-116-0x0000023D53C20000-0x0000023D53C22000-memory.dmp
memory/3744-114-0x0000023D397A0000-0x0000023D397A1000-memory.dmp