Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 68223906cb363760…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:30:07 Authoring application: Microsoft Excel First seen: 2021-11-03
MD5: 5d02aa679a736296398058a64683a63b SHA-1: 405965f0b64c481042f5eb33b8b5ef57c78120e6 SHA-256: 68223906cb36376011004e77d92172ad05aa0dcd4d49127cbe1dc003a4664e8c
140 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon file opening. The macro sheet contains references to dangerous formula APIs, specifically the RUN function, suggesting it is designed to execute arbitrary commands.

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) 6469 bytes
SHA-256: a187281115d565b6c380a7ee14c7e621245dd65e443fd2bd01b0a91f7dc4098e
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 -  cxFcx
' 0018     26 LABEL : Cell Value, String Constant - aiVQxtiQclt len=0 
' 0018     26 LABEL : Cell Value, String Constant - aMbxmHuAvPV len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A155 
' 0018     21 LABEL : Cell Value, String Constant - CgMyPa len=0 
' 0018     22 LABEL : Cell Value, String Constant - dOLaxEe len=0 
' 0018     26 LABEL : Cell Value, String Constant - FmUGkSMEeKZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - fzbiZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - GCgziiQccI len=0 
' 0018     27 LABEL : Cell Value, String Constant - hpmyukYwbroG len=0 
' 0018     25 LABEL : Cell Value, String Constant - HXKsDdaZKG len=0 
' 0018     22 LABEL : Cell Value, String Constant - jRTMuux len=0 
' 0018     20 LABEL : Cell Value, String Constant - LAbyS len=0 
' 0018     22 LABEL : Cell Value, String Constant - LTIoDIJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - mqIqD len=0 
' 0018     21 LABEL : Cell Value, String Constant - NfTHUz len=0 
' 0018     23 LABEL : Cell Value, String Constant - NhYfbPDr len=0 
' 0018     26 LABEL : Cell Value, String Constant - UauLMLTCDhk len=0 
' 0018     23 LABEL : Cell Value, String Constant - VABCIUqy len=0 
' 0018     21 LABEL : Cell Value, String Constant - wvqBgV len=0 
' 0018     22 LABEL : Cell Value, String Constant - XmrWNgc len=0 
' 0018     23 LABEL : Cell Value, String Constant - zvQSyvtA 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 LABELS
... (truncated)

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