Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e70ddbdaf4ca9294…

MALICIOUS

Office (OOXML)

88.8 KB Created: 2016-05-11 15:51:01 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-05-23
MD5: f6bfb16348557fd128bfe5e47d6bcf86 SHA-1: 6b486293c8625447a4e58ba73006fd8c38b3453b SHA-256: e70ddbdaf4ca92944671090567917f421298c6a536fb9c2979eeba6bd0c14f4c
470 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The sample is an Excel document containing a VBA macro with an Auto_Open subroutine. This subroutine executes a PowerShell command using cmd.exe, which is designed to download and execute a second-stage payload. The encoded command is: "echo \"X5O!P%@APl4\PZX44(P^))7C(A7}A$EICAR-S TANDIVIRUS-TEST!@$H*H*\" ". This indicates a typical downloader pattern. The presence of the EICAR test file URL in the script further supports its malicious nature.

Heuristics 11

  • ClamAV: Xls.Malware.Generic-10013209-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Generic-10013209-0
  • Spreadsheet DDE link launches a dangerous command critical OOXML_SPREADSHEET_DDE_MALICIOUS
    Excel workbook contains an externalLinks/ddeLink entry whose ddeService/ddeTopic launches a dangerous executable. This is SpreadsheetML DDE command execution, distinct from WordprocessingML DDE field instructions.
  • VBA project inside OOXML medium 5 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 "powershell.exe -NoExit -EncodedCommand ZQBjAGgAbwAgACIAWAA1AE8AIQBQACUAQABBAFAAWwA0AFwAUABaAFgANQA0ACgAUABeACkANwBDAEMAKQA3AH0AYAAkAEUASQBDAEEAUgAtAFMAVABBAE4ARABBAFIARAAtAEEATgBUAEkAVgBJAFIAVQBTAC0AVABFAFMAVAAtAEYASQBMAEUAIQBgACQASAArAEgAKgAiAA=="
End Sub
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
        Shell "powershell.exe -NoExit -EncodedCommand ZQBjAGgAbwAgACIAWAA1AE8AIQBQACUAQABBAFAAWwA0AFwAUABaAFgANQA0ACgAUABeACkANwBDAEMAKQA3AH0AYAAkAEUASQBDAEEAUgAtAFMAVABBAE4ARABBAFIARAAtAEEATgBUAEkAVgBJAFIAVQBTAC0AVABFAFMAVAAtAEYASQBMAEUAIQBgACQASAArAEgAKgAiAA=="
End Sub
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
    Matched line in script
        Shell "cmd.exe /K echo " + eicarPart1 + eicarPart2
End Sub
  • 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.
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Attribute VB_Name = "Module1"
Sub Auto_Open()
    ' https://github.com/mattias-ohlsson/eicar-standard-antivirus-test-files
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • External relationship medium OOXML_EXTERNAL_REL
    External target in xl/externalLinks/_rels/externalLink1.xml.rels: /Users/X91927/Documents/PTs/2021/Mar/Uniplatform/COR28ABAL20210202.xlsm
  • 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 https://github.com/mattias-ohlsson/eicar-standard-antivirus-test-files OOXML external relationship

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) 5877 bytes
SHA-256: 78d0e92cb6a0535fbafd9e01ad865eae1321a76685493b1037d1a6b5045ff795
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains a PowerShell -EncodedCommand style payload. Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub Auto_Open()
    ' https://github.com/mattias-ohlsson/eicar-standard-antivirus-test-files

    Shell "powershell.exe -NoExit -EncodedCommand ZQBjAGgAbwAgACIAWAA1AE8AIQBQACUAQABBAFAAWwA0AFwAUABaAFgANQA0ACgAUABeACkANwBDAEMAKQA3AH0AYAAkAEUASQBDAEEAUgAtAFMAVABBAE4ARABBAFIARAAtAEEATgBUAEkAVgBJAFIAVQBTAC0AVABFAFMAVAAtAEYASQBMAEUAIQBgACQASAArAEgAKgAiAA=="
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

Attribute VB_Name = "Sheet4"
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 = "Sheet5"
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 = "Sheet6"
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 = "Sheet7"
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 = "Sheet8"
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 = "Sheet9"
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 = "Sheet10"
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
Sub Auto_Open()
    ' https://github.com/mattias-ohlsson/eicar-standard-antivirus-test-files

    ' Simple obfuscation
    Dim eicarPart1 As String
    Dim eicarPart2 As String
    eicarPart1 = "X5O!P%@AP[4\PZX54(P^^)7C"
    eicarPart2 = "C)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*"

    Shell "cmd.exe /K echo " + eicarPart1 + eicarPart2
End Sub


Attribute VB_Name = "Sheet11"
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 = "Sheet12"
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 = "Sheet13"
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 = "Sheet14"
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 = "Sheet15"
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 = "Sheet16"
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 33280 bytes
SHA-256: d072c625f187a8d4df4a93930f863c6a691e51866149af7e21fb5fbc1e8afce9
Detection
ClamAV: Xls.Malware.Generic-10013209-0
Obfuscation or payload: likely
Carved artifact contains a PowerShell -EncodedCommand style payload. Carved artifact contains 1 long base64-like blob(s).

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