Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0f8399dc10c1dcfe…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:03 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 3c6c31f46a5b76f8af7056bf312a5e31 SHA-1: 5b158466d188d1115d13086cb494f760bbe431ba SHA-256: 0f8399dc10c1dcfe690ecd456b92ba5d83d09b27561d46276064865926e26f9f
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet containing an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further confirms the intent to execute arbitrary commands. While no specific URLs or hashes were extracted, the macro's structure strongly suggests it's designed to download and execute a secondary payload.

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) 6807 bytes
SHA-256: ba5d2f5ceafaefc825e52014cbc1b5f3748a2dfaf07c10f91e41910a60976b31
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  mBgRMKDgkQ
' 0018     20 LABEL : Cell Value, String Constant - ALZav len=0 
' 0018     26 LABEL : Cell Value, String Constant - ArfUJSoOyhq len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B179 
' 0018     27 LABEL : Cell Value, String Constant - EbSUgZwpyBWz len=0 
' 0018     27 LABEL : Cell Value, String Constant - eqQVBjcSoQlX len=0 
' 0018     20 LABEL : Cell Value, String Constant - eRbGL len=0 
' 0018     24 LABEL : Cell Value, String Constant - EUpLbUROI len=0 
' 0018     22 LABEL : Cell Value, String Constant - FFsoptm len=0 
' 0018     22 LABEL : Cell Value, String Constant - HFgIERF len=0 
' 0018     23 LABEL : Cell Value, String Constant - inJslIuz len=0 
' 0018     20 LABEL : Cell Value, String Constant - itJRd len=0 
' 0018     20 LABEL : Cell Value, String Constant - jmBex len=0 
' 0018     22 LABEL : Cell Value, String Constant - JOagmkA len=0 
' 0018     27 LABEL : Cell Value, String Constant - KwJgHIyInNWZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - pApZzXXVylaV len=0 
' 0018     21 LABEL : Cell Value, String Constant - qyQetu len=0 
' 0018     22 LABEL : Cell Value, String Constant - RXHhBEG len=0 
' 0018     23 LABEL : Cell Value, String Constant - sRsHPRrP len=0 
' 0018     25 LABEL : Cell Value, String Constant - UxphJHvHcn len=0 
' 0018     23 LABEL : Cell Value, String Constant - vNqzTyyB len=0 
' 0018     23 LABEL : Cell Value, String Constant - wQevPtkS 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     1
... (truncated)

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