Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 646176f6911fb979…

MALICIOUS

Office (OLE) / .XLS

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 12b56cc99338d2ab1f4f553df7e7e63f SHA-1: 3ae77879c5d54cf4afb8b532044fa41eac62ad4b SHA-256: 646176f6911fb979bd6b24096d294149642fdc37cf1d151a76e7648f0fb0b933
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file contains Excel 4.0 (XLM) macros, including an Auto_Open defined name, which is a critical finding. The macros utilize dangerous formula APIs, specifically the RUN function, indicating an attempt to execute arbitrary code. The embedded URLs likely serve as the source for a second-stage payload. The presence of an 'enable lure' heuristic suggests the document attempts to trick the user into enabling macros.

Heuristics 5

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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 https://techserve4u.com/utlqwePl9XKr/alex.html In document text (OLE body)
    • https://evershinesoftware.com/isei5Q7KlsQ5/alex.htmlIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
599707db4356dee9b1659b3a18ea6968bd26a6e750ede458308d788c900c5e21		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 5292 bytes
Preview script
First 1,000 lines of the extracted script
' 0085     11 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - Docs
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - Docs1
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - Docs2
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - Docs3
' 0018     33 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=18 ptgRef3d 65535!A1 *UNKNOWN TOKEN* 0x0000 *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x01\x00\x01\x00\x01\x00\x0e\x001'
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 0204     54 LABEL : Cell Value, String Constant
' 0204     60 LABEL : Cell Value, String Constant
' 0204     20 LABEL : Cell Value, String Constant
' 0204     10 LABEL : Cell Value, String Constant
' 0204     10 LABEL : Cell Value, String Constant
' 0204      9 LABEL : Cell Value, String Constant
' 0204     10 LABEL : Cell Value, String Constant
' 0204     11 LABEL : Cell Value, String Constant
' 0204      9 LABEL : Cell Value, String Constant
' 0204     12 LABEL : Cell Value, String Constant
' 0204     11 LABEL : Cell Value, String Constant
' 0204     13 LABEL : Cell Value, String Constant
' 0204     13 LABEL : Cell Value, String Constant
' 0204     10 LABEL : Cell Value, String Constant
' 0204      9 LABEL : Cell Value, String Constant
' 0204     13 LABEL : Cell Value, String Constant
' 0204     15 LABEL : Cell Value, String Constant
' 0204      9 LABEL : Cell Value, String Constant
' 0204     10 LABEL : Cell Value, String Constant
' 0204     11 LABEL : Cell Value, String Constant
' 0204     12 LABEL : Cell Value, String Constant
' 0204     12 LABEL : Cell Value, String Constant
' Sheet,Reference,Formula,Value
' Docs1,BX17,"['"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"', '65534!A1']",""
' Docs2,BO21,"['"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR>"&"<ERROR
... (truncated)

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