Analysis
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max time kernel
36s -
max time network
43s -
platform
windows10-2004_x64 -
resource
win10v2004-20230703-en -
resource tags
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submitted
09/07/2023, 13:24
General
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Target
BridgeReview_protected.exe
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Size
2.8MB
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MD5
fefd90a570c93a0a2ec4838ad5e077f0
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SHA1
81c0a7c797cd74e639ff97ecbdfba368549c6bb2
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SHA256
bb7f46fde76addee53d6e9765b4b55e440698cfed873d01547f7eb43e16a38f5
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SHA512
f32011517dbe54fce044da65fca1663e3e82acc0fa2443c69e6f3d0fc461f0bf2b512f4450dec0ad281a2a5f4f7abfbe20423843c10fb6d36e558a2e4e34b3d5
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SSDEEP
49152:Y9JYJBVie9pMadBi6ZGLXIE/3sT1DS8f9rIxCpSvHusz6fm26n9qdMg4B7i6:zJB/bbiBI31D5f9PkvOaPnDB7i6
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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Process spawned unexpected child process 12 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
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DCRat payload 4 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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Executes dropped EXE 1 IoCs
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Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
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Suspicious use of NtSetInformationThreadHideFromDebugger 5 IoCs
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Drops file in Program Files directory 5 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Checks SCSI registry key(s) 3 TTPs 3 IoCs
SCSI information is often read in order to detect sandboxing environments.
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Creates scheduled task(s) 1 TTPs 12 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Modifies registry class 2 IoCs
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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 7 IoCs
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Suspicious use of FindShellTrayWindow 54 IoCs
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Suspicious use of SendNotifyMessage 54 IoCs
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Suspicious use of SetWindowsHookEx 2 IoCs
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Suspicious use of WriteProcessMemory 11 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\BridgeReview_protected.exe"C:\Users\Admin\AppData\Local\Temp\BridgeReview_protected.exe"1⤵
- Checks computer location settings
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\6uMYZ5DmT2.bat"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:23⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:24⤵
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C:\Program Files (x86)\Windows Multimedia Platform\csrss.exe"C:\Program Files (x86)\Windows Multimedia Platform\csrss.exe"3⤵
- Executes dropped EXE
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Windows Multimedia Platform\csrss.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Multimedia Platform\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Multimedia Platform\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sysmons" /sc MINUTE /mo 9 /tr "'C:\Users\Default\SendTo\sysmon.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Users\Default\SendTo\sysmon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sysmons" /sc MINUTE /mo 10 /tr "'C:\Users\Default\SendTo\sysmon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsassl" /sc MINUTE /mo 7 /tr "'C:\Users\Default User\lsass.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Users\Default User\lsass.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsassl" /sc MINUTE /mo 8 /tr "'C:\Users\Default User\lsass.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "upfcu" /sc MINUTE /mo 8 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\upfc.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office 15\ClientX64\upfc.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "upfcu" /sc MINUTE /mo 11 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\upfc.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\taskmgr.exe"C:\Windows\system32\taskmgr.exe" /41⤵
- Checks SCSI registry key(s)
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
2.8MB
MD5fefd90a570c93a0a2ec4838ad5e077f0
SHA181c0a7c797cd74e639ff97ecbdfba368549c6bb2
SHA256bb7f46fde76addee53d6e9765b4b55e440698cfed873d01547f7eb43e16a38f5
SHA512f32011517dbe54fce044da65fca1663e3e82acc0fa2443c69e6f3d0fc461f0bf2b512f4450dec0ad281a2a5f4f7abfbe20423843c10fb6d36e558a2e4e34b3d5
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Filesize
2.8MB
MD5fefd90a570c93a0a2ec4838ad5e077f0
SHA181c0a7c797cd74e639ff97ecbdfba368549c6bb2
SHA256bb7f46fde76addee53d6e9765b4b55e440698cfed873d01547f7eb43e16a38f5
SHA512f32011517dbe54fce044da65fca1663e3e82acc0fa2443c69e6f3d0fc461f0bf2b512f4450dec0ad281a2a5f4f7abfbe20423843c10fb6d36e558a2e4e34b3d5
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Filesize
2.8MB
MD5fefd90a570c93a0a2ec4838ad5e077f0
SHA181c0a7c797cd74e639ff97ecbdfba368549c6bb2
SHA256bb7f46fde76addee53d6e9765b4b55e440698cfed873d01547f7eb43e16a38f5
SHA512f32011517dbe54fce044da65fca1663e3e82acc0fa2443c69e6f3d0fc461f0bf2b512f4450dec0ad281a2a5f4f7abfbe20423843c10fb6d36e558a2e4e34b3d5
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Filesize
225B
MD56c425f641403ae9dae881f6c40dcff05
SHA1c57ff87bc81eab666c46395791b1e10066d78449
SHA256954d6299f1aa54d2cfd84b8b0ba0129e5dea5bf6fbaef94928f120b722e4acbb
SHA51273d635cdb58abb2743ac7c992815c1e2601ee519e3c088c0b45710985a43b57f736bba946aa96b2e628190c2a0eb9406a31bd321b075309ba0ccbc3a288940dd
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Filesize
500B
MD58eb84f17f1c134253db29bb3f7cf09f3
SHA123a8be46ca6ec3019b02c22a8e53c4c6b4b0c7da
SHA2566fc4a73a21ef5103b5ffec9ca526e39c191a4848a76dfb5ed19949a4cfbb0d28
SHA51250d57777850350302f2ef628ac5ceaa6b882340fc82b0945c5d791e409bb71bf5aa89bf5eabadaf47334634b1d05b4b12c52fce4cb085ec08b097c9b48ee81e2
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Filesize
4KB
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Filesize
4KB
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Filesize
4KB
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Filesize
4KB
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Filesize
4KB
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Filesize
4KB
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Filesize
4KB
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Filesize
4KB
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Filesize
4KB
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Filesize
4KB
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Filesize
584KB
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Filesize
408KB
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Filesize
5.4MB
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Filesize
5.4MB
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Filesize
320KB
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Filesize
64KB
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Filesize
5.6MB
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Filesize
5.4MB
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Filesize
5.4MB
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Filesize
5.4MB
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Filesize
5.4MB
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Filesize
5.4MB