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Analysis
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max time kernel
150s -
max time network
122s -
platform
windows7_x64 -
resource
win7-20231215-en -
resource tags
arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system -
submitted
24/01/2024, 10:28 UTC
Static task
static1
1 signatures
Behavioral task
behavioral1
Sample
71fde528cb5b8c054c163b4dee2f695e.exe
Resource
win7-20231215-en
windows7-x64
8 signatures
150 seconds
Behavioral task
behavioral2
Sample
71fde528cb5b8c054c163b4dee2f695e.exe
Resource
win10v2004-20231222-en
windows10-2004-x64
7 signatures
150 seconds
General
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Target
71fde528cb5b8c054c163b4dee2f695e.exe
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Size
94KB
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MD5
71fde528cb5b8c054c163b4dee2f695e
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SHA1
745eb0a909613a612e22345e478c167949529186
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SHA256
bf8737c19f3524d55476474700b5f329bbccb93cae13383bdcf33881bfb5487d
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SHA512
2e9f61b72c1035e43e077cb2f243427605665f1d16cb16f313db08b67050a62c0dda48a2993b4ac0bcb4141ea191ca4be34eec5e79b6653a72ec11d718c77085
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SSDEEP
1536:uoDbjEPwyUgtYqYSF9khAdHIFn8ccQIwUtiLuo:uyb+5YSFurcQIwUtiLuo
Score
7/10
Malware Config
Signatures
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Executes dropped EXE 2 IoCs
pid Process 1084 cssrs.exe 2132 cssrs.exe -
Loads dropped DLL 4 IoCs
pid Process 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 1084 cssrs.exe 1084 cssrs.exe -
Adds Run key to start application 2 TTPs 18 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft system = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\TINTSETP = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\ctfmen = "C:\\WINDOWS\\system32\\cssrs.exe" 71fde528cb5b8c054c163b4dee2f695e.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft csrss = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\TINTSETP = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\RunOnceEx\IMJPMG = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft system = "C:\\WINDOWS\\system32\\cssrs.exe" 71fde528cb5b8c054c163b4dee2f695e.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\RunOnceEx\IMJPMG = "C:\\WINDOWS\\system32\\cssrs.exe" 71fde528cb5b8c054c163b4dee2f695e.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft system = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\Microsoft service = "C:\\WINDOWS\\system32\\cssrs.exe" 71fde528cb5b8c054c163b4dee2f695e.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\TINTSETP = "C:\\WINDOWS\\system32\\cssrs.exe" 71fde528cb5b8c054c163b4dee2f695e.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\Microsoft service = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\ctfmen = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft csrss = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\ctfmen = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\RunOnceEx\IMJPMG = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\Microsoft csrss = "C:\\WINDOWS\\system32\\cssrs.exe" 71fde528cb5b8c054c163b4dee2f695e.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\Microsoft service = "C:\\WINDOWS\\system32\\cssrs.exe" cssrs.exe -
Drops file in System32 directory 4 IoCs
description ioc Process File created C:\WINDOWS\SysWOW64\cssrs.exe 71fde528cb5b8c054c163b4dee2f695e.exe File opened for modification C:\WINDOWS\SysWOW64\cssrs.exe 71fde528cb5b8c054c163b4dee2f695e.exe File created C:\WINDOWS\SysWOW64\cssrs.exe cssrs.exe File created C:\WINDOWS\SysWOW64\cssrs.exe cssrs.exe -
description ioc Process Key created \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Internet Explorer\Main cssrs.exe Key created \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Internet Explorer\Main cssrs.exe Key created \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Internet Explorer\Main 71fde528cb5b8c054c163b4dee2f695e.exe -
Modifies Internet Explorer start page 1 TTPs 3 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Internet Explorer\Main\Start Page = "www.muluwu.com" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Internet Explorer\Main\Start Page = "www.muluwu.com" cssrs.exe Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Internet Explorer\Main\Start Page = "www.muluwu.com" 71fde528cb5b8c054c163b4dee2f695e.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 2152 71fde528cb5b8c054c163b4dee2f695e.exe 1084 cssrs.exe 2132 cssrs.exe 1084 cssrs.exe 2132 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 1084 cssrs.exe 2132 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 1084 cssrs.exe 2132 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 1084 cssrs.exe 2132 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 1084 cssrs.exe 2132 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 1084 cssrs.exe 2132 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 1084 cssrs.exe 2132 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 2132 cssrs.exe 1084 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 1084 cssrs.exe 2132 cssrs.exe 2152 71fde528cb5b8c054c163b4dee2f695e.exe 1084 cssrs.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 2152 wrote to memory of 1084 2152 71fde528cb5b8c054c163b4dee2f695e.exe 28 PID 2152 wrote to memory of 1084 2152 71fde528cb5b8c054c163b4dee2f695e.exe 28 PID 2152 wrote to memory of 1084 2152 71fde528cb5b8c054c163b4dee2f695e.exe 28 PID 2152 wrote to memory of 1084 2152 71fde528cb5b8c054c163b4dee2f695e.exe 28 PID 1084 wrote to memory of 2132 1084 cssrs.exe 29 PID 1084 wrote to memory of 2132 1084 cssrs.exe 29 PID 1084 wrote to memory of 2132 1084 cssrs.exe 29 PID 1084 wrote to memory of 2132 1084 cssrs.exe 29
Processes
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C:\Users\Admin\AppData\Local\Temp\71fde528cb5b8c054c163b4dee2f695e.exe"C:\Users\Admin\AppData\Local\Temp\71fde528cb5b8c054c163b4dee2f695e.exe"1⤵
- Loads dropped DLL
- Adds Run key to start application
- Drops file in System32 directory
- Modifies Internet Explorer settings
- Modifies Internet Explorer start page
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2152 -
C:\WINDOWS\SysWOW64\cssrs.exeC:\WINDOWS\system32\cssrs.exe2⤵
- Executes dropped EXE
- Loads dropped DLL
- Adds Run key to start application
- Drops file in System32 directory
- Modifies Internet Explorer settings
- Modifies Internet Explorer start page
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1084 -
C:\WINDOWS\SysWOW64\cssrs.exeC:\WINDOWS\system32\cssrs.exe3⤵
- Executes dropped EXE
- Adds Run key to start application
- Drops file in System32 directory
- Modifies Internet Explorer settings
- Modifies Internet Explorer start page
- Suspicious behavior: EnumeratesProcesses
PID:2132
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
94KB
MD571fde528cb5b8c054c163b4dee2f695e
SHA1745eb0a909613a612e22345e478c167949529186
SHA256bf8737c19f3524d55476474700b5f329bbccb93cae13383bdcf33881bfb5487d
SHA5122e9f61b72c1035e43e077cb2f243427605665f1d16cb16f313db08b67050a62c0dda48a2993b4ac0bcb4141ea191ca4be34eec5e79b6653a72ec11d718c77085