Analysis
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max time kernel
150s -
max time network
147s -
platform
windows7_x64 -
resource
win7-20241023-en -
resource tags
arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system -
submitted
09-11-2024 19:05
Static task
static1
Behavioral task
behavioral1
Sample
3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe
Resource
win7-20241023-en
Behavioral task
behavioral2
Sample
3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe
Resource
win10v2004-20241007-en
General
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Target
3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe
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Size
416KB
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MD5
ae00ad0a951b7f5fd34acd8c1d3cb1c3
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SHA1
d15761a9272edd220b76ce2063714a09cca3c4e7
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SHA256
3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f
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SHA512
a16a61cc3625279c381a05acdc50e9e4c8ebb296884cac3000f0702bfc30bdcdd3d971fcd6db4c35469be4cd8d7ba9544f01cbcabb7a35ad3ce0d76d905869cf
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SSDEEP
6144:3w9D91dOrcN3ZGXNYFNmIkYvUIelVjjVtGRyFH4:gtRfJcNYFNm8UhlZGse
Malware Config
Signatures
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Blocklisted process makes network request 10 IoCs
Processes:
rundll32.exeflow pid process 4 2944 rundll32.exe 5 2944 rundll32.exe 6 2944 rundll32.exe 7 2944 rundll32.exe 8 2944 rundll32.exe 9 2944 rundll32.exe 10 2944 rundll32.exe 11 2944 rundll32.exe 13 2944 rundll32.exe 14 2944 rundll32.exe -
Deletes itself 1 IoCs
Processes:
yrsby.exepid process 2376 yrsby.exe -
Executes dropped EXE 1 IoCs
Processes:
yrsby.exepid process 2376 yrsby.exe -
Loads dropped DLL 6 IoCs
Processes:
cmd.exerundll32.exepid process 1444 cmd.exe 1444 cmd.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe -
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Adds Run key to start application 2 TTPs 1 IoCs
Processes:
rundll32.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\Dotx = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\zsufy\\vgwcs.dll\",Verify" rundll32.exe -
Enumerates connected drives 3 TTPs 23 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
Processes:
rundll32.exedescription ioc process File opened (read-only) \??\p: rundll32.exe File opened (read-only) \??\r: rundll32.exe File opened (read-only) \??\s: rundll32.exe File opened (read-only) \??\i: rundll32.exe File opened (read-only) \??\j: rundll32.exe File opened (read-only) \??\n: rundll32.exe File opened (read-only) \??\o: rundll32.exe File opened (read-only) \??\u: rundll32.exe File opened (read-only) \??\w: rundll32.exe File opened (read-only) \??\x: rundll32.exe File opened (read-only) \??\y: rundll32.exe File opened (read-only) \??\a: rundll32.exe File opened (read-only) \??\b: rundll32.exe File opened (read-only) \??\k: rundll32.exe File opened (read-only) \??\m: rundll32.exe File opened (read-only) \??\g: rundll32.exe File opened (read-only) \??\h: rundll32.exe File opened (read-only) \??\t: rundll32.exe File opened (read-only) \??\z: rundll32.exe File opened (read-only) \??\e: rundll32.exe File opened (read-only) \??\l: rundll32.exe File opened (read-only) \??\q: rundll32.exe File opened (read-only) \??\v: rundll32.exe -
Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
Processes:
rundll32.exedescription ioc process File opened for modification \??\PHYSICALDRIVE0 rundll32.exe -
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
Processes:
rundll32.exepid process 2944 rundll32.exe -
Drops file in Program Files directory 2 IoCs
Processes:
yrsby.exedescription ioc process File opened for modification \??\c:\Program Files\zsufy yrsby.exe File created \??\c:\Program Files\zsufy\vgwcs.dll yrsby.exe -
System Location Discovery: System Language Discovery 1 TTPs 5 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
Processes:
rundll32.exe3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.execmd.exePING.EXEyrsby.exedescription ioc process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language cmd.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language PING.EXE Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language yrsby.exe -
System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs
Adversaries may check for Internet connectivity on compromised systems.
Processes:
cmd.exePING.EXEpid process 1444 cmd.exe 1736 PING.EXE -
Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
rundll32.exedescription ioc process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 rundll32.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString rundll32.exe -
Runs ping.exe 1 TTPs 1 IoCs
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Suspicious behavior: EnumeratesProcesses 64 IoCs
Processes:
rundll32.exepid process 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe 2944 rundll32.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
rundll32.exedescription pid process Token: SeDebugPrivilege 2944 rundll32.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
Processes:
3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exeyrsby.exepid process 2624 3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe 2376 yrsby.exe -
Suspicious use of WriteProcessMemory 19 IoCs
Processes:
3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.execmd.exeyrsby.exedescription pid process target process PID 2624 wrote to memory of 1444 2624 3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe cmd.exe PID 2624 wrote to memory of 1444 2624 3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe cmd.exe PID 2624 wrote to memory of 1444 2624 3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe cmd.exe PID 2624 wrote to memory of 1444 2624 3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe cmd.exe PID 1444 wrote to memory of 1736 1444 cmd.exe PING.EXE PID 1444 wrote to memory of 1736 1444 cmd.exe PING.EXE PID 1444 wrote to memory of 1736 1444 cmd.exe PING.EXE PID 1444 wrote to memory of 1736 1444 cmd.exe PING.EXE PID 1444 wrote to memory of 2376 1444 cmd.exe yrsby.exe PID 1444 wrote to memory of 2376 1444 cmd.exe yrsby.exe PID 1444 wrote to memory of 2376 1444 cmd.exe yrsby.exe PID 1444 wrote to memory of 2376 1444 cmd.exe yrsby.exe PID 2376 wrote to memory of 2944 2376 yrsby.exe rundll32.exe PID 2376 wrote to memory of 2944 2376 yrsby.exe rundll32.exe PID 2376 wrote to memory of 2944 2376 yrsby.exe rundll32.exe PID 2376 wrote to memory of 2944 2376 yrsby.exe rundll32.exe PID 2376 wrote to memory of 2944 2376 yrsby.exe rundll32.exe PID 2376 wrote to memory of 2944 2376 yrsby.exe rundll32.exe PID 2376 wrote to memory of 2944 2376 yrsby.exe rundll32.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe"C:\Users\Admin\AppData\Local\Temp\3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2624 -
C:\Windows\SysWOW64\cmd.execmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\yrsby.exe "C:\Users\Admin\AppData\Local\Temp\3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe"2⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Suspicious use of WriteProcessMemory
PID:1444 -
C:\Windows\SysWOW64\PING.EXEping 127.0.0.1 -n 23⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:1736 -
C:\Users\Admin\AppData\Local\Temp\yrsby.exeC:\Users\Admin\AppData\Local\Temp\\yrsby.exe "C:\Users\Admin\AppData\Local\Temp\3a698dd58a116915f6a48fe8423a5a8e45f528ac2ce1bd0e6a822950955ad99f.exe"3⤵
- Deletes itself
- Executes dropped EXE
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2376 -
\??\c:\windows\SysWOW64\rundll32.exec:\windows\system32\rundll32.exe "c:\Program Files\zsufy\vgwcs.dll",Verify C:\Users\Admin\AppData\Local\Temp\yrsby.exe4⤵
- Blocklisted process makes network request
- Loads dropped DLL
- Adds Run key to start application
- Enumerates connected drives
- Writes to the Master Boot Record (MBR)
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2944
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Pre-OS Boot
1Bootkit
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Credential Access
Credentials from Password Stores
1Credentials from Web Browsers
1Unsecured Credentials
1Credentials In Files
1Replay Monitor
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Downloads
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Filesize
416KB
MD50d6d1deaa701a1c69003f5e16489e636
SHA10b7fcf210e3636d543e7f1f78aa3c21fa45e2239
SHA25650a27a18fd9a99f05e088eb9fcf8db43ddf9ff08bd099f50d8c8be7eb87acb9b
SHA51241b0f84790070e26c6535dab6d670c98e23c48ddaae6cc21136789c9ef18dadf82bece6be31a2d998700df88301e3700e9d332b2f3cfe004eeee4bab21f2339a
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Filesize
228KB
MD5ae1bc5ee3f1c7e857ff0522324ebc7d0
SHA1c2f2feb1b8502c2ddc95b8e45fc7434b0edbdfd2
SHA25636c7c545800e6aba9675d1530da05578722ad9d6829a4c3e1df7cda9e9d81823
SHA512bcda250b2e68bbdf7b5a6f252f1da9388ba207e9655cf752c788e513f1ede9e059747411ca9ab9018108d9a1a75a30fdfa05f034ad6bcae2bc39f207af80dac6