Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 071ac2b4b1634004…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:38:55 Authoring application: Microsoft Excel First seen: 2021-11-03
MD5: 22b78e5f65fc926c94247759139935b7 SHA-1: 13c73d2c84ce8e6be3c819fe91ade957af8ab217 SHA-256: 071ac2b4b16340040555a3b062e60a8c2994c8278947649c4360d127e50b309d
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 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 technique is common for initial execution.

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) 6317 bytes
SHA-256: a86cfa96b694b380821cda1a6ffe08f51385a5cf1b2670e1c0650400082d9461
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 -  cLb
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B139 
' 0018     23 LABEL : Cell Value, String Constant - buYXkeLx len=0 
' 0018     20 LABEL : Cell Value, String Constant - DANOn len=0 
' 0018     20 LABEL : Cell Value, String Constant - dszLa len=0 
' 0018     23 LABEL : Cell Value, String Constant - eBaAEQsW len=0 
' 0018     20 LABEL : Cell Value, String Constant - epUIa len=0 
' 0018     26 LABEL : Cell Value, String Constant - FgBiTFDYwiW len=0 
' 0018     21 LABEL : Cell Value, String Constant - HqpiqH len=0 
' 0018     27 LABEL : Cell Value, String Constant - NawbSLyrlfdz len=0 
' 0018     21 LABEL : Cell Value, String Constant - OmRMaI len=0 
' 0018     26 LABEL : Cell Value, String Constant - ooFZJrUlXsC len=0 
' 0018     25 LABEL : Cell Value, String Constant - ROMLNQYBpS len=0 
' 0018     21 LABEL : Cell Value, String Constant - STUhhL len=0 
' 0018     20 LABEL : Cell Value, String Constant - tBmZk len=0 
' 0018     22 LABEL : Cell Value, String Constant - TGpIKwv len=0 
' 0018     20 LABEL : Cell Value, String Constant - uaQgA len=0 
' 0018     26 LABEL : Cell Value, String Constant - UfFIxfBVeqM len=0 
' 0018     27 LABEL : Cell Value, String Constant - uhKmQUlxvmCg len=0 
' 0018     24 LABEL : Cell Value, String Constant - umasKapwo len=0 
' 0018     26 LABEL : Cell Value, String Constant - VcIdnxRgLSR len=0 
' 0018     21 LABEL : Cell Value, String Constant - zkQsEH 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 LABELSST :
... (truncated)

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