Office (OOXML) / .XLSM malware analysis — malicious · 2c58f9200fa0ba53

MALICIOUS

Office (OOXML) / .XLSM

13.0 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300

MD5: 5829c9ae7550bd07d8cba5ac603785d5 SHA-1: b35a390ff93fb2d2274e6ed676ad3277b24168fa SHA-256: 2c58f9200fa0ba538d0b92806a7e21a8e95cd45f8b7f0c588a897a5abb71da56

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The file is an XLSM document containing VBA macros. The Workbook_Open macro is present and utilizes Shell() calls, combined with character-shift decoding, to execute a payload. This indicates a macro-based execution chain designed to run arbitrary commands.

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` `a3fbc4f12e195e2c15463eb92813d69a83ee91217dc74c1b81e11dccd8c195b6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2028 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` `952db59d81e08dd1d3fcff40376e01c802a7be481df234755cab976c4732194b`	vba-project	OOXML VBA project: xl/vbaProject.bin	14848 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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