Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5354a70855dec120…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:36 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: f04bb7840461dc6207f381acedfa6836 SHA-1: 7572b19ee1846addb897558653d1705c5c54602b SHA-256: 5354a70855dec1204299ee50391ec37fa1245e642ed487409839717693b6da70
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known method for executing malicious code upon opening the workbook. The critical heuristic firings 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, and no direct IOCs like URLs or hashes were extracted from the macro content itself.

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) 6905 bytes
SHA-256: 5982a7d2abcb7e5c9b8240891af8f13a47a26b7c8662e677c4212d36350fb562
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 -  RVpdeSfSgl
' 0018     23 LABEL : Cell Value, String Constant - aSCebCwy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G185 
' 0018     21 LABEL : Cell Value, String Constant - BvIlKL len=0 
' 0018     25 LABEL : Cell Value, String Constant - duRpsZFYrR len=0 
' 0018     25 LABEL : Cell Value, String Constant - DvroIWFnXm len=0 
' 0018     26 LABEL : Cell Value, String Constant - hqiuqjWxWKt len=0 
' 0018     23 LABEL : Cell Value, String Constant - jcDwsYko len=0 
' 0018     21 LABEL : Cell Value, String Constant - JIymXp len=0 
' 0018     22 LABEL : Cell Value, String Constant - JuBGpeQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - KaLVmqsyM len=0 
' 0018     27 LABEL : Cell Value, String Constant - lQNlnHhwFQNM len=0 
' 0018     24 LABEL : Cell Value, String Constant - mFmFhlGzy len=0 
' 0018     25 LABEL : Cell Value, String Constant - MrEZqfbTId len=0 
' 0018     23 LABEL : Cell Value, String Constant - NTBnBUMk len=0 
' 0018     25 LABEL : Cell Value, String Constant - OTsIDSUWMo len=0 
' 0018     25 LABEL : Cell Value, String Constant - PEQEISAhlQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - QzPRUaovV len=0 
' 0018     22 LABEL : Cell Value, String Constant - srJCNui len=0 
' 0018     20 LABEL : Cell Value, String Constant - UMhcm len=0 
' 0018     25 LABEL : Cell Value, String Constant - XqbQZLsrod len=0 
' 0018     24 LABEL : Cell Value, String Constant - ybObTLhLg 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
' 
... (truncated)

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