Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4d9503567e7c920e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:26 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: 594e9b56efa91fffbf58dcdc58228e81 SHA-1: f1b095d3603649fbf8e6ae71a0df1f6aec0855a7 SHA-256: 4d9503567e7c920e02c20b93a5cf82352cdc93ec37404808eb26c943f47ece00
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While the exact payload is not discernible from the provided evidence, the mechanism points to a downloader or initial execution stage.

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) 6617 bytes
SHA-256: 009c2a529b2ab0e11319f8e31ec8ba83df9b3ec9476c8c705045e5f9c1b0aeef
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  aIpCZDaBr
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C180 
' 0018     23 LABEL : Cell Value, String Constant - AYLjGoLb len=0 
' 0018     25 LABEL : Cell Value, String Constant - DcOGAhOeij len=0 
' 0018     22 LABEL : Cell Value, String Constant - EIDeCKm len=0 
' 0018     24 LABEL : Cell Value, String Constant - ErXyHUFTG len=0 
' 0018     21 LABEL : Cell Value, String Constant - fKnEcI len=0 
' 0018     22 LABEL : Cell Value, String Constant - jSqkewM len=0 
' 0018     24 LABEL : Cell Value, String Constant - kSMklZsVd len=0 
' 0018     21 LABEL : Cell Value, String Constant - LGESec len=0 
' 0018     21 LABEL : Cell Value, String Constant - lQgSsc len=0 
' 0018     20 LABEL : Cell Value, String Constant - LyuHh len=0 
' 0018     23 LABEL : Cell Value, String Constant - pSnnhQKi len=0 
' 0018     24 LABEL : Cell Value, String Constant - qhEXRRpFR len=0 
' 0018     21 LABEL : Cell Value, String Constant - TlYFDW len=0 
' 0018     22 LABEL : Cell Value, String Constant - tndGdRP len=0 
' 0018     21 LABEL : Cell Value, String Constant - UqIOcP len=0 
' 0018     26 LABEL : Cell Value, String Constant - varlGGzMLxl len=0 
' 0018     27 LABEL : Cell Value, String Constant - YRDPBzpUjnNG len=0 
' 0018     25 LABEL : Cell Value, String Constant - yVvyBXjYVp len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZkqXjkvTV len=0 
' 0018     25 LABEL : Cell Value, String Constant - ztoXmVNWXf 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 LA
... (truncated)

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