Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 75f447417864e99f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:44 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 32e71e041c761109687272ccc8b4a3f9 SHA-1: 450caae271208935e8305826984250523793cb64 SHA-256: 75f447417864e99fab3260be6e9b1cd502f9e6878a62db5e9fd7631e2bf0c14c
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-enabled workbook containing an Auto_Open function, which is a common technique for executing malicious code upon opening. The presence of dangerous formula APIs in the Auto_Open macro indicates an intent to run arbitrary commands, likely to download and execute a secondary payload. No specific family could be identified from the available 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) 6625 bytes
SHA-256: ff899fe6483b7c6808fc84d11153fa85c1ad422d238075f4b6c9e74a94b245cb
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xNeui
' 0018     25 LABEL : Cell Value, String Constant - aIktrDuJZa len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E179 
' 0018     21 LABEL : Cell Value, String Constant - bfhwfD len=0 
' 0018     22 LABEL : Cell Value, String Constant - dBvRaQF len=0 
' 0018     23 LABEL : Cell Value, String Constant - dWwvPyko len=0 
' 0018     23 LABEL : Cell Value, String Constant - EucdBMqU len=0 
' 0018     20 LABEL : Cell Value, String Constant - EZmVt len=0 
' 0018     25 LABEL : Cell Value, String Constant - FsoZCNOQUo len=0 
' 0018     23 LABEL : Cell Value, String Constant - gBjWSRqf len=0 
' 0018     26 LABEL : Cell Value, String Constant - HXDzrcsyifv len=0 
' 0018     22 LABEL : Cell Value, String Constant - iDTrDiB len=0 
' 0018     21 LABEL : Cell Value, String Constant - oEVkOq len=0 
' 0018     24 LABEL : Cell Value, String Constant - OHrtNVyAg len=0 
' 0018     23 LABEL : Cell Value, String Constant - pxPmnmPp len=0 
' 0018     27 LABEL : Cell Value, String Constant - qUApjZoszpOP len=0 
' 0018     20 LABEL : Cell Value, String Constant - sLvrK len=0 
' 0018     27 LABEL : Cell Value, String Constant - YwjOxVFHTjfb len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZGVzJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZHzcIvixLfGy len=0 
' 0018     22 LABEL : Cell Value, String Constant - zKypGdS len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZMyzcMRwEhKd 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
... (truncated)

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