Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 03505437b2fb8acd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:52 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 678ad4f3c74067c3d22458aaa35b2a3d SHA-1: 4b1a023ecac6653b2dfb160746089f08de4fbfcc SHA-256: 03505437b2fb8acd64ca0298951975ad96709fae0749f53d22f9715e9fcd3be6
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 detected as malicious. Heuristics indicate the presence of an Auto_Open function, which is a common technique for executing malicious code upon opening the document. The XLM macros likely contain formulas that call dangerous API functions, such as RUN, to execute arbitrary code, potentially downloading and running a second-stage payload.

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) 6660 bytes
SHA-256: e9e4312490a6ca3121bdf442ddb92e8a061ad9259305023bbd4838c3c840c2fa
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  oVtpZdjYBSD
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B159 
' 0018     24 LABEL : Cell Value, String Constant - BUlVvKhSB len=0 
' 0018     22 LABEL : Cell Value, String Constant - cDFLQqK len=0 
' 0018     27 LABEL : Cell Value, String Constant - dyuoejrPkDIM len=0 
' 0018     27 LABEL : Cell Value, String Constant - fpvLgzBxMXlE len=0 
' 0018     23 LABEL : Cell Value, String Constant - HgYxPWUY len=0 
' 0018     26 LABEL : Cell Value, String Constant - HlOpXRFoeHY len=0 
' 0018     21 LABEL : Cell Value, String Constant - JdxalG len=0 
' 0018     26 LABEL : Cell Value, String Constant - JLKAGeGIMjq len=0 
' 0018     26 LABEL : Cell Value, String Constant - MFcxYJgVAur len=0 
' 0018     23 LABEL : Cell Value, String Constant - mxDqDEBb len=0 
' 0018     20 LABEL : Cell Value, String Constant - NRBuD len=0 
' 0018     27 LABEL : Cell Value, String Constant - oQTkMvYLyEkm len=0 
' 0018     27 LABEL : Cell Value, String Constant - PRKqVOSCZdxR len=0 
' 0018     24 LABEL : Cell Value, String Constant - RagFNhjyJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - sPhjes len=0 
' 0018     24 LABEL : Cell Value, String Constant - tMwefhLVF len=0 
' 0018     21 LABEL : Cell Value, String Constant - WGniQq len=0 
' 0018     26 LABEL : Cell Value, String Constant - xtYoJNLNIKB len=0 
' 0018     21 LABEL : Cell Value, String Constant - YrNwjG len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZMKZLuDD 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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