Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ea1209629d718e86…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:28 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: 6409975175656c3ac9f1a8384f06e495 SHA-1: d32647b404e1e12a84ba0330f8a4a8d72fb0af21 SHA-256: ea1209629d718e869415183157eedd58472cd0d433edadbfcf07cc8c3e13e680
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. Static analysis identified an Auto_Open defined name, indicating that a macro will execute automatically upon opening the document. The presence of dangerous formula APIs within the XLM macro suggests it is designed to execute commands, likely leading to further malicious activity.

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) 6898 bytes
SHA-256: fc4379f2fa4aed03e615f7a2aad968fdd7fb0e23823a1e1f2bcf7902293017d8
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 -  piMegzUtlru
' 0018     26 LABEL : Cell Value, String Constant - agDrVkmqDHu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B157 
' 0018     20 LABEL : Cell Value, String Constant - CGrRG len=0 
' 0018     24 LABEL : Cell Value, String Constant - DNtfBAnMe len=0 
' 0018     21 LABEL : Cell Value, String Constant - enEmii len=0 
' 0018     21 LABEL : Cell Value, String Constant - EsVtAz len=0 
' 0018     26 LABEL : Cell Value, String Constant - IZGxnlTJOdP len=0 
' 0018     24 LABEL : Cell Value, String Constant - jEjhwfvcL len=0 
' 0018     27 LABEL : Cell Value, String Constant - khQxTJWKVmlL len=0 
' 0018     20 LABEL : Cell Value, String Constant - MZrbS len=0 
' 0018     22 LABEL : Cell Value, String Constant - nGRRoqI len=0 
' 0018     20 LABEL : Cell Value, String Constant - OBtHC len=0 
' 0018     25 LABEL : Cell Value, String Constant - pXPBWoudVt len=0 
' 0018     23 LABEL : Cell Value, String Constant - qalDZEHy len=0 
' 0018     27 LABEL : Cell Value, String Constant - QXJagZqWfQrY len=0 
' 0018     21 LABEL : Cell Value, String Constant - sgztOv len=0 
' 0018     21 LABEL : Cell Value, String Constant - snKBVg len=0 
' 0018     22 LABEL : Cell Value, String Constant - VPvZDIV len=0 
' 0018     20 LABEL : Cell Value, String Constant - XsPpf len=0 
' 0018     23 LABEL : Cell Value, String Constant - yFSLvmJl len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZNkJYaeMicC 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)

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