Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 41834b3553132a24…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:47 Authoring application: Microsoft Excel First seen: 2021-10-16
MD5: 18139f42abf082e54fc6ee314477ba3e SHA-1: 375acb828ce964471a94acda8481aaf103b8ff75 SHA-256: 41834b3553132a24476476209bf191ca6c42f515734b9475c3abd69631514a8f
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function, which is a common technique for executing malicious code. The presence of dangerous formula APIs within the Auto_Open macro suggests an intent to perform harmful actions, likely downloading and executing a secondary payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro code 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) 6602 bytes
SHA-256: 304418419986fe215d97b9e34000ec671794208dc842677274852c434c7e9ec3
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 -  ipB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A170 
' 0018     24 LABEL : Cell Value, String Constant - cTieJZUdc len=0 
' 0018     27 LABEL : Cell Value, String Constant - CWHUrgKoApIN len=0 
' 0018     26 LABEL : Cell Value, String Constant - FFgvyxhZYuh len=0 
' 0018     20 LABEL : Cell Value, String Constant - FmHYW len=0 
' 0018     22 LABEL : Cell Value, String Constant - FsqqtCD len=0 
' 0018     22 LABEL : Cell Value, String Constant - GPbazOI len=0 
' 0018     24 LABEL : Cell Value, String Constant - Jvxjqlfsi len=0 
' 0018     25 LABEL : Cell Value, String Constant - JWCujmTvZL len=0 
' 0018     20 LABEL : Cell Value, String Constant - maMBc len=0 
' 0018     22 LABEL : Cell Value, String Constant - mknWjsx len=0 
' 0018     23 LABEL : Cell Value, String Constant - NDQpaWgi len=0 
' 0018     22 LABEL : Cell Value, String Constant - njmGsdV len=0 
' 0018     22 LABEL : Cell Value, String Constant - ojmcJdZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - PbBfYk len=0 
' 0018     27 LABEL : Cell Value, String Constant - pNzisdxyRrPq len=0 
' 0018     23 LABEL : Cell Value, String Constant - TiuINORE len=0 
' 0018     20 LABEL : Cell Value, String Constant - TjnZR len=0 
' 0018     25 LABEL : Cell Value, String Constant - UqSLYDcWnc len=0 
' 0018     26 LABEL : Cell Value, String Constant - VFZNyqMXVXv len=0 
' 0018     21 LABEL : Cell Value, String Constant - YUDcXx 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 LABELSS
... (truncated)

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