Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d024dfc88ef7b09e…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:45:31 Authoring application: Microsoft Excel First seen: 2021-09-22
MD5: dc1926f95819e8d77f947eb38e924d8d SHA-1: 1e143360bb19b4cefdbd8aedfc9587e4ac454d13 SHA-256: d024dfc88ef7b09e634e6a7929313e79abbe1bb82eecf50b3276d4bb6b31d7fc
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 references to dangerous formula APIs, specifically 'RUN', suggesting it attempts to execute an external program. No specific IOCs like URLs or file paths were extracted, but the technique itself is highly suspicious.

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) 6665 bytes
SHA-256: 46b85681402cd1ebc699da9914254b4ad8dfbe7f93b15f6d277c9a2d90bc9fcc
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Orhc
' 0018     23 LABEL : Cell Value, String Constant - aaaTvJVK len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B139 
' 0018     26 LABEL : Cell Value, String Constant - aUtpGpFVhGB len=0 
' 0018     25 LABEL : Cell Value, String Constant - BxHYLUdtmC len=0 
' 0018     20 LABEL : Cell Value, String Constant - EBVAC len=0 
' 0018     23 LABEL : Cell Value, String Constant - FImQOsnu len=0 
' 0018     23 LABEL : Cell Value, String Constant - GAEKvjKa len=0 
' 0018     25 LABEL : Cell Value, String Constant - hrqVPOIEUI len=0 
' 0018     25 LABEL : Cell Value, String Constant - JRpVnzphwC len=0 
' 0018     24 LABEL : Cell Value, String Constant - kRrxJpYiv len=0 
' 0018     25 LABEL : Cell Value, String Constant - pGzfNmKQhH len=0 
' 0018     21 LABEL : Cell Value, String Constant - pOarro len=0 
' 0018     21 LABEL : Cell Value, String Constant - QeUlPj len=0 
' 0018     21 LABEL : Cell Value, String Constant - QQvvSy len=0 
' 0018     22 LABEL : Cell Value, String Constant - ReduazX len=0 
' 0018     26 LABEL : Cell Value, String Constant - tgJHjdYarhB len=0 
' 0018     22 LABEL : Cell Value, String Constant - TzbItIg len=0 
' 0018     22 LABEL : Cell Value, String Constant - uhYEWGC len=0 
' 0018     22 LABEL : Cell Value, String Constant - VhcyyeB len=0 
' 0018     27 LABEL : Cell Value, String Constant - zfzBdxHktvzf len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZXASO 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 LABEL
... (truncated)

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