Analysis
- max time kernel
150s - max time network
147s - platform
windows10_x64 - resource
win10v20201028 - submitted
18/12/2020, 08:41
Static task
static1
Behavioral task
behavioral1
Sample
91731e95e8f4be683efc909b0f932958.exe
Resource
win7v20201028
windows7_x64
0 signatures
0 seconds
Behavioral task
behavioral2
Sample
91731e95e8f4be683efc909b0f932958.exe
Resource
win10v20201028
windows10_x64
0 signatures
0 seconds
General
- Target 91731e95e8f4be683efc909b0f932958.exe
- Size 1.1MB
- Sample201218-2rm16nf8ex
- SHA256 3ae5425033502bba7f7b8c7498573f7ca17e7e98e14288f734adb1a5af19318d
- MD5 91731e95e8f4be683efc909b0f932958
- SHA1 35ef2e58df1d9c2bb164701d930f69a469a9f383
- SHA512 2663840ed55082d73dac99f8a1484407c6a73d9ce50ba22134c815c7a66287acdde6aaaf93ebf7ecc13dbe36ff62108e90b63c4ddbea0c6208bdacb2aed75831
- MD5 SHA1 SHA512
Score
10/10
Malware Config
Extracted
Family
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remcos
C2
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daya4659.ddns.net:8282
Signatures
- Suspicious use of NtCreateProcessExOtherParentProcess 1 IoCs
description pid Process procid_target PID 1876 created 1596 1876 WerFault.exe 85 - ServiceHost packer 4 IoCs
Detects ServiceHost packer used for .NET malware
resource yara_rule behavioral2/memory/1596-20-0x000000000042800A-mapping.dmp servicehost behavioral2/memory/1596-21-0x000000000042800A-mapping.dmp servicehost behavioral2/memory/1596-22-0x000000000042800A-mapping.dmp servicehost behavioral2/memory/1596-23-0x000000000042800A-mapping.dmp servicehost - Executes dropped EXE 7 IoCs
pid Process 588 remcos.exe 1184 remcos.exe 2248 sfc.exe 2072 sfc.exe 4536 sfc.exe 4520 sfc.exe 3940 sfc.exe - Adds Run key to start application 2 TTPs 8 IoCs
description ioc Process Key created \REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ remcos.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\"" remcos.exe Key created \REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\ 91731e95e8f4be683efc909b0f932958.exe Set value (str) \REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\"" 91731e95e8f4be683efc909b0f932958.exe Key created \REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ 91731e95e8f4be683efc909b0f932958.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\"" 91731e95e8f4be683efc909b0f932958.exe Key created \REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\ remcos.exe Set value (str) \REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\"" remcos.exe - Suspicious use of SetThreadContext 5 IoCs
description pid Process procid_target PID 4804 set thread context of 4312 4804 91731e95e8f4be683efc909b0f932958.exe 75 PID 588 set thread context of 1184 588 remcos.exe 84 PID 1184 set thread context of 1596 1184 remcos.exe 85 PID 2248 set thread context of 2072 2248 sfc.exe 92 PID 4536 set thread context of 4520 4536 sfc.exe 96 - Program crash 1 IoCs
pid pid_target Process procid_target 1876 1596 WerFault.exe 85 - Creates scheduled task(s) 1 TTPs 4 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 3308 schtasks.exe 2304 schtasks.exe 2200 schtasks.exe 4608 schtasks.exe - Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000_Classes\Local Settings 91731e95e8f4be683efc909b0f932958.exe - Suspicious behavior: EnumeratesProcesses 15 IoCs
pid Process 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe 1876 WerFault.exe - Suspicious behavior: GetForegroundWindowSpam 1 IoCs
pid Process 1184 remcos.exe - Suspicious use of AdjustPrivilegeToken 3 IoCs
description pid Process Token: SeRestorePrivilege 1876 WerFault.exe Token: SeBackupPrivilege 1876 WerFault.exe Token: SeDebugPrivilege 1876 WerFault.exe - Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 1184 remcos.exe - Suspicious use of WriteProcessMemory 51 IoCs
description pid Process procid_target PID 4804 wrote to memory of 4312 4804 91731e95e8f4be683efc909b0f932958.exe 75 PID 4804 wrote to memory of 4312 4804 91731e95e8f4be683efc909b0f932958.exe 75 PID 4804 wrote to memory of 4312 4804 91731e95e8f4be683efc909b0f932958.exe 75 PID 4804 wrote to memory of 4312 4804 91731e95e8f4be683efc909b0f932958.exe 75 PID 4804 wrote to memory of 4312 4804 91731e95e8f4be683efc909b0f932958.exe 75 PID 4312 wrote to memory of 4420 4312 91731e95e8f4be683efc909b0f932958.exe 76 PID 4312 wrote to memory of 4420 4312 91731e95e8f4be683efc909b0f932958.exe 76 PID 4312 wrote to memory of 4420 4312 91731e95e8f4be683efc909b0f932958.exe 76 PID 4804 wrote to memory of 3308 4804 91731e95e8f4be683efc909b0f932958.exe 77 PID 4804 wrote to memory of 3308 4804 91731e95e8f4be683efc909b0f932958.exe 77 PID 4804 wrote to memory of 3308 4804 91731e95e8f4be683efc909b0f932958.exe 77 PID 4420 wrote to memory of 4444 4420 WScript.exe 79 PID 4420 wrote to memory of 4444 4420 WScript.exe 79 PID 4420 wrote to memory of 4444 4420 WScript.exe 79 PID 4444 wrote to memory of 588 4444 cmd.exe 81 PID 4444 wrote to memory of 588 4444 cmd.exe 81 PID 4444 wrote to memory of 588 4444 cmd.exe 81 PID 588 wrote to memory of 1184 588 remcos.exe 84 PID 588 wrote to memory of 1184 588 remcos.exe 84 PID 588 wrote to memory of 1184 588 remcos.exe 84 PID 588 wrote to memory of 1184 588 remcos.exe 84 PID 588 wrote to memory of 1184 588 remcos.exe 84 PID 1184 wrote to memory of 1596 1184 remcos.exe 85 PID 1184 wrote to memory of 1596 1184 remcos.exe 85 PID 1184 wrote to memory of 1596 1184 remcos.exe 85 PID 1184 wrote to memory of 1596 1184 remcos.exe 85 PID 1184 wrote to memory of 1596 1184 remcos.exe 85 PID 1184 wrote to memory of 1596 1184 remcos.exe 85 PID 1184 wrote to memory of 1596 1184 remcos.exe 85 PID 1184 wrote to memory of 1596 1184 remcos.exe 85 PID 1184 wrote to memory of 1596 1184 remcos.exe 85 PID 1184 wrote to memory of 1596 1184 remcos.exe 85 PID 588 wrote to memory of 2304 588 remcos.exe 88 PID 588 wrote to memory of 2304 588 remcos.exe 88 PID 588 wrote to memory of 2304 588 remcos.exe 88 PID 2248 wrote to memory of 2072 2248 sfc.exe 92 PID 2248 wrote to memory of 2072 2248 sfc.exe 92 PID 2248 wrote to memory of 2072 2248 sfc.exe 92 PID 2248 wrote to memory of 2072 2248 sfc.exe 92 PID 2248 wrote to memory of 2072 2248 sfc.exe 92 PID 2248 wrote to memory of 2200 2248 sfc.exe 93 PID 2248 wrote to memory of 2200 2248 sfc.exe 93 PID 2248 wrote to memory of 2200 2248 sfc.exe 93 PID 4536 wrote to memory of 4520 4536 sfc.exe 96 PID 4536 wrote to memory of 4520 4536 sfc.exe 96 PID 4536 wrote to memory of 4520 4536 sfc.exe 96 PID 4536 wrote to memory of 4520 4536 sfc.exe 96 PID 4536 wrote to memory of 4520 4536 sfc.exe 96 PID 4536 wrote to memory of 4608 4536 sfc.exe 97 PID 4536 wrote to memory of 4608 4536 sfc.exe 97 PID 4536 wrote to memory of 4608 4536 sfc.exe 97
Processes
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C:\Users\Admin\AppData\Local\Temp\91731e95e8f4be683efc909b0f932958.exe"C:\Users\Admin\AppData\Local\Temp\91731e95e8f4be683efc909b0f932958.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4804 -
C:\Users\Admin\AppData\Local\Temp\91731e95e8f4be683efc909b0f932958.exe"C:\Users\Admin\AppData\Local\Temp\91731e95e8f4be683efc909b0f932958.exe"2⤵
- Adds Run key to start application
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4312 -
C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"3⤵
- Suspicious use of WriteProcessMemory
PID:4420 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\remcos\remcos.exe"4⤵
- Suspicious use of WriteProcessMemory
PID:4444 -
C:\Users\Admin\AppData\Roaming\remcos\remcos.exeC:\Users\Admin\AppData\Roaming\remcos\remcos.exe5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:588 -
C:\Users\Admin\AppData\Roaming\remcos\remcos.exe"C:\Users\Admin\AppData\Roaming\remcos\remcos.exe"6⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1184 -
C:\Windows\SysWOW64\svchost.exeC:\Windows\SysWOW64\svchost.exe7⤵PID:1596
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 1596 -s 5888⤵
- Suspicious use of NtCreateProcessExOtherParentProcess
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1876
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\SysWOW64\schtasks.exe" /create /tn setx /tr "C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe" /sc minute /mo 1 /F6⤵
- Creates scheduled task(s)
PID:2304
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\SysWOW64\schtasks.exe" /create /tn setx /tr "C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe" /sc minute /mo 1 /F2⤵
- Creates scheduled task(s)
PID:3308
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C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exeC:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2248 -
C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe"C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe"2⤵
- Executes dropped EXE
PID:2072
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\SysWOW64\schtasks.exe" /create /tn setx /tr "C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe" /sc minute /mo 1 /F2⤵
- Creates scheduled task(s)
PID:2200
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C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exeC:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4536 -
C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe"C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe"2⤵
- Executes dropped EXE
PID:4520
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\SysWOW64\schtasks.exe" /create /tn setx /tr "C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe" /sc minute /mo 1 /F2⤵
- Creates scheduled task(s)
PID:4608
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C:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exeC:\Users\Admin\AppData\Roaming\CapabilityAccessHandlers\sfc.exe1⤵
- Executes dropped EXE
PID:3940