Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e85756f3530096b1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:31 Authoring application: Microsoft Excel First seen: 2021-09-22
MD5: 6981adebc5441f5eebcb7a151811efc1 SHA-1: bc7899afdb22aa5f8a8e469b3cee9e1aab836abc SHA-256: e85756f3530096b154eefffcfe79ea2caee207feae713ee452e1d064b7c593ce
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, suggesting an intent to execute arbitrary code. The XLM macro sheet likely contains functionality to download and execute a second-stage payload, although the specific URLs or commands are not directly visible in the provided evidence.

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) 6563 bytes
SHA-256: 58020d5bd0ec352b3f640b6dc97c3b72b2588148f6704ed2740a54844818f8ee
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 -  REX
' 0018     25 LABEL : Cell Value, String Constant - aJTNJpWvkX len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B156 
' 0018     25 LABEL : Cell Value, String Constant - BvViNocHgT len=0 
' 0018     25 LABEL : Cell Value, String Constant - FepUihgjeN len=0 
' 0018     24 LABEL : Cell Value, String Constant - ggwDfMRws len=0 
' 0018     24 LABEL : Cell Value, String Constant - GMQJPHqVK len=0 
' 0018     25 LABEL : Cell Value, String Constant - HAjybAWuhn len=0 
' 0018     27 LABEL : Cell Value, String Constant - IawGgDuxLzTK len=0 
' 0018     23 LABEL : Cell Value, String Constant - jqeQIwGw len=0 
' 0018     26 LABEL : Cell Value, String Constant - MIZPLlGEPlu len=0 
' 0018     27 LABEL : Cell Value, String Constant - NzzrCTVRwCQi len=0 
' 0018     21 LABEL : Cell Value, String Constant - PMtDkt len=0 
' 0018     24 LABEL : Cell Value, String Constant - RbXQfchZJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - sGUFjsQPg len=0 
' 0018     22 LABEL : Cell Value, String Constant - TdvEVNX len=0 
' 0018     22 LABEL : Cell Value, String Constant - vjhEmgb len=0 
' 0018     25 LABEL : Cell Value, String Constant - vJhvHdoHtK len=0 
' 0018     21 LABEL : Cell Value, String Constant - wiVHiC len=0 
' 0018     23 LABEL : Cell Value, String Constant - xfkMnaNE len=0 
' 0018     20 LABEL : Cell Value, String Constant - XPcak len=0 
' 0018     20 LABEL : Cell Value, String Constant - yEuqh 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    
... (truncated)

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