Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3ed504e3ddb33b42…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:35 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: d036167591e73a4c8668234fcbc4a373 SHA-1: b8b4c309441be0f20708ea343ce4e32be86007c2 SHA-256: 3ed504e3ddb33b4257133c2c32398d2048d4e8b69023e4a596dd07ecdd878e7c
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 critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to run arbitrary commands. No specific family could be identified, but the execution method is clear.

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) 6623 bytes
SHA-256: 52e890dfd8466562ef4d1344c441d3faf8af2ea9c5c0530ebd22ad838c145fa3
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 -  WgjfVsqXqG
' 0018     27 LABEL : Cell Value, String Constant - AfHALETqwyCT len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G150 
' 0018     20 LABEL : Cell Value, String Constant - auWLp len=0 
' 0018     20 LABEL : Cell Value, String Constant - BPIwv len=0 
' 0018     25 LABEL : Cell Value, String Constant - DArFnDnzKd len=0 
' 0018     24 LABEL : Cell Value, String Constant - ESxmKrfOK len=0 
' 0018     25 LABEL : Cell Value, String Constant - FclreqogrO len=0 
' 0018     24 LABEL : Cell Value, String Constant - gdfBEaXbs len=0 
' 0018     21 LABEL : Cell Value, String Constant - GSLqTR len=0 
' 0018     22 LABEL : Cell Value, String Constant - GymSFKv len=0 
' 0018     22 LABEL : Cell Value, String Constant - hxQINwf len=0 
' 0018     27 LABEL : Cell Value, String Constant - lEQjYxFKgsSi len=0 
' 0018     25 LABEL : Cell Value, String Constant - MLwUJFADaE len=0 
' 0018     20 LABEL : Cell Value, String Constant - MNeUs len=0 
' 0018     23 LABEL : Cell Value, String Constant - mOdciYJt len=0 
' 0018     20 LABEL : Cell Value, String Constant - NhNHp len=0 
' 0018     22 LABEL : Cell Value, String Constant - NoUGHcQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - RvHfvlzbl len=0 
' 0018     27 LABEL : Cell Value, String Constant - vHwlTYkxRLRu len=0 
' 0018     22 LABEL : Cell Value, String Constant - vXAgrmU len=0 
' 0018     20 LABEL : Cell Value, String Constant - whsUp 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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