Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 113509dce9003f00…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:51 Authoring application: Microsoft Excel First seen: 2021-09-22
MD5: dc22c07da3425aa2e88b8a63003355c7 SHA-1: 987d8894d97363d87dbbcf9606d61b26539bb6d3 SHA-256: 113509dce9003f00d052459576cf7d8f9b3d11d62b6ecaa4d29315bba2afa114
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel workbook containing Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting an attempt to run arbitrary commands or exploit vulnerabilities. No specific URLs or hashes were extracted, but the presence of the Auto_Open macro is a strong indicator of malicious intent.

Heuristics 3

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6535 bytes
SHA-256: 9c67e5c8585d9e86547e9a7fe84449f0396a70fc8624e8aa0b05ce4c06d67b1d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  cvS
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E183 
' 0018     22 LABEL : Cell Value, String Constant - bBALozL len=0 
' 0018     25 LABEL : Cell Value, String Constant - DcVhFYDXUw len=0 
' 0018     20 LABEL : Cell Value, String Constant - dhFjt len=0 
' 0018     21 LABEL : Cell Value, String Constant - dXIFCE len=0 
' 0018     25 LABEL : Cell Value, String Constant - fTyJyzDEBe len=0 
' 0018     21 LABEL : Cell Value, String Constant - fwNFpZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - GeSmUy len=0 
' 0018     26 LABEL : Cell Value, String Constant - iIlLEJxWVUX len=0 
' 0018     23 LABEL : Cell Value, String Constant - JlnxVLJw len=0 
' 0018     23 LABEL : Cell Value, String Constant - JuIfxpwW len=0 
' 0018     20 LABEL : Cell Value, String Constant - kpGhY len=0 
' 0018     22 LABEL : Cell Value, String Constant - nEaubzS len=0 
' 0018     20 LABEL : Cell Value, String Constant - onMMQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - QUqBbZmH len=0 
' 0018     25 LABEL : Cell Value, String Constant - RliSdDPdxl len=0 
' 0018     21 LABEL : Cell Value, String Constant - TnnopH len=0 
' 0018     23 LABEL : Cell Value, String Constant - wQSVznQb len=0 
' 0018     26 LABEL : Cell Value, String Constant - xiwUFkvKGMd len=0 
' 0018     27 LABEL : Cell Value, String Constant - zoZJAuFyBqDe len=0 
' 0018     27 LABEL : Cell Value, String Constant - zxlMQVovLsDQ len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST
... (truncated)

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