Office (OOXML) / .XLSX malware analysis — malicious · a3097da7eefef6b6

MALICIOUS

Office (OOXML) / .XLSX

64.7 KB Created: 2020-05-06 07:08:10 UTC Authoring application: Microsoft Excel 15.0300

MD5: a57bba079a188bf21faeaae68986126c SHA-1: 0bc0ddf243771a71749c1df7ea485ce66793c61e SHA-256: a3097da7eefef6b62e636fb175a0e17ee1459541e98ca8dfac67f321a93cf317

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter

The file is a malicious Excel macro-enabled document. The Workbook_Open macro is present and uses the Shell() function, combined with character-shift decoding (Mid/Asc/Chr), to execute a command. This is a common technique for downloading and executing further malicious content. No specific family could be identified.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL

VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `1a2f77ab81b06b0ebb9de69d3121819c4c608c6b589d2cd6930415f3de80a378`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1790 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `ea897ee5fbdb65461d1c163b13e37ec711e14946380fba01c0e76009d3369dc9`	vba-project	OOXML VBA project: xl/vbaProject.bin	14336 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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