Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8b2e1628dc966b4f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:03 Authoring application: Microsoft Excel First seen: 2021-09-27
MD5: 46b04b3aeb21fd97874589ad3a3c1398 SHA-1: 667d2b14b125147df7127590b41815effa3f6027 SHA-256: 8b2e1628dc966b4fb30184ceea7c95a58aeb5d5b7e879d80b25fe1b446340bca
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a common technique for executing malicious code upon opening the workbook. The macro sheet contains formulas that are flagged as dangerous, suggesting it attempts to run arbitrary commands or exploit vulnerabilities. The specific formulas and their intended actions are not fully discernible from the provided truncated script data.

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) 6657 bytes
SHA-256: 3d8209a5ab91dc104989aedf63920a0d0c890ff467dcbe1bb2833641a13dcc77
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 -  vSebF
' 0018     22 LABEL : Cell Value, String Constant - AeWgdZZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ALeydzRZEsLE len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I175 
' 0018     26 LABEL : Cell Value, String Constant - BKniLLafrpS len=0 
' 0018     23 LABEL : Cell Value, String Constant - Bywjydot len=0 
' 0018     25 LABEL : Cell Value, String Constant - lhgEvEKXFH len=0 
' 0018     22 LABEL : Cell Value, String Constant - moSKoOG len=0 
' 0018     21 LABEL : Cell Value, String Constant - mpfoEL len=0 
' 0018     25 LABEL : Cell Value, String Constant - nXffPdcdkb len=0 
' 0018     25 LABEL : Cell Value, String Constant - OBLJhffqoK len=0 
' 0018     27 LABEL : Cell Value, String Constant - PnwhkxzXJLlu len=0 
' 0018     24 LABEL : Cell Value, String Constant - RBmlYDRUh len=0 
' 0018     24 LABEL : Cell Value, String Constant - REfSLBOxO len=0 
' 0018     27 LABEL : Cell Value, String Constant - RXBMbhBtHqgl len=0 
' 0018     25 LABEL : Cell Value, String Constant - sBDwTdXwPr len=0 
' 0018     24 LABEL : Cell Value, String Constant - sUpLRevrI len=0 
' 0018     26 LABEL : Cell Value, String Constant - ThUNkikUxaV len=0 
' 0018     22 LABEL : Cell Value, String Constant - urrQOIR len=0 
' 0018     22 LABEL : Cell Value, String Constant - vigDjhD len=0 
' 0018     24 LABEL : Cell Value, String Constant - WTHlVXHwZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - xdCAinulBB 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/
... (truncated)

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