Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f2cef468dcd4495f…

MALICIOUS

Office (OOXML)

17.8 KB Created: 2021-06-29 01:09:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2021-07-10
MD5: e5f2669ab0331bac162882096dd5e7aa SHA-1: a1af81e7965a99eb89dbeb7245ab5d98094a5a9d SHA-256: f2cef468dcd4495f496825e3d904c1fbf7259363d1fb24d95ecda993aff596f0
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

This OOXML document contains a VBA macro that executes upon opening. The macro uses WScript.Shell to run the command 'cmd.exe /c start notepad.exe', indicating an attempt to launch a process. The presence of the Document_Open macro and the use of Shell() and CreateObject() strongly suggest malicious intent, likely to download and execute a secondary payload.

Heuristics 7

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    Sub ruuuun(cmdfffs As String)
sheell = "WSCript.shell"
Set vavx = CreateObject(sheell)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    sheell = "WSCript.shell"
Set vavx = CreateObject(sheell)
cmdfff = 0
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
    Matched line in script
    On Error Resume Next
cmfdddddd = "cmd.exe /c start notepad.exe"
ruuuun (cmfdddddd)
  • 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()
  • 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.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.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/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)

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) 654 bytes
SHA-256: 2ae8258ace40a476b154e45d68777fca6c0e374bb2ee4c0e70d88aea0d4df5d7
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

Sub Document_Open()

Call rwfp.noteppp

End Sub


Attribute VB_Name = "rwfp"
Sub noteppp()
On Error Resume Next
cmfdddddd = "cmd.exe /c start notepad.exe"
ruuuun (cmfdddddd)
End Sub
Sub ruuuun(cmdfffs As String)
sheell = "WSCript.shell"
Set vavx = CreateObject(sheell)
cmdfff = 0
thlxufony = vavx.Run(cmdfffs, cmdfff)
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 16896 bytes
SHA-256: 5b7ae2f6f58cc0b7b9f1ec4e85a9324e97609f00faf52a4235d5fdbfc5c23fab

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