Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d73d97f2af7cc6ab…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:26 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: e6744aab1197a74b5bae107e192416e1 SHA-1: a205fafa08d1e50be999539ccf73e932f50491ed SHA-256: d73d97f2af7cc6abcfb9aceb0baa6a87ca55802f6442bb795e4e09c529e056ce
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 function, which is a known method for executing malicious code. The presence of dangerous formula APIs within the Auto_Open macro indicates an intent to run arbitrary commands, likely to download and execute a secondary payload. The macro sheet itself contains obfuscated data, further suggesting 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) 6876 bytes
SHA-256: 1729dae5f884891e0658ed0846179e4f5a21cb9e4a8991268de726ca43d53404
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  fgyQjczkxrc
' 0018     21 LABEL : Cell Value, String Constant - ASQYpX len=0 
' 0018     24 LABEL : Cell Value, String Constant - AuRfcfmmz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I193 
' 0018     27 LABEL : Cell Value, String Constant - cCjkYGviMWom len=0 
' 0018     27 LABEL : Cell Value, String Constant - FQfJmNTNDhvM len=0 
' 0018     27 LABEL : Cell Value, String Constant - GurcEjWKFdvE len=0 
' 0018     26 LABEL : Cell Value, String Constant - HBhtgFklcUQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - iGnTPcsh len=0 
' 0018     22 LABEL : Cell Value, String Constant - IJCZtqr len=0 
' 0018     25 LABEL : Cell Value, String Constant - KkPuYrbomk len=0 
' 0018     20 LABEL : Cell Value, String Constant - lHBaG len=0 
' 0018     24 LABEL : Cell Value, String Constant - ncxvMwKbi len=0 
' 0018     21 LABEL : Cell Value, String Constant - RMIzAT len=0 
' 0018     24 LABEL : Cell Value, String Constant - ruWSssTHG len=0 
' 0018     20 LABEL : Cell Value, String Constant - sDjFA len=0 
' 0018     26 LABEL : Cell Value, String Constant - SFOkWZogJym len=0 
' 0018     22 LABEL : Cell Value, String Constant - tpIzIFq len=0 
' 0018     21 LABEL : Cell Value, String Constant - VxUXok len=0 
' 0018     25 LABEL : Cell Value, String Constant - wibldAnKaO len=0 
' 0018     24 LABEL : Cell Value, String Constant - xyWWzHqYE len=0 
' 0018     22 LABEL : Cell Value, String Constant - yFNTjnd 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
' 00
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.