Office (OOXML) / .XLSX malware analysis — malicious · b276fe5d9dd0b7a5

MALICIOUS

Office (OOXML) / .XLSX

67.2 KB Created: 2012-10-19 22:33:57 UTC Authoring application: Microsoft Excel 12.0000

MD5: e5cda272601a8aa0e57a89f8fd529c32 SHA-1: 2bfbb60d009b245c2094353e7561bcf538dc9dc0 SHA-256: b276fe5d9dd0b7a5313d99533aabe325b42f0dc2d3ea01ed0f8ae1b5b691209a

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1218 System Binary Proxy Execution

The file is an XLSX document containing VBA macros, with a Workbook_Open macro designed to execute automatically. The script utilizes CreateObject to interact with the file system and potentially download or execute further payloads, evidenced by the creation of a file in the user profile directory and the use of LOLBins. The script's intent is to download and execute a second-stage payload, as indicated by the file creation and the use of CreateObject for system interaction.

Heuristics 6

LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin reference in VBA
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` `c35370f56a18b77e90fad0e54d7270422ad4dd415b97b6103eba31c1629d52fc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `66dccc6230654f38e1419aaa7a33fd6df70bd6d6eabdbd252d1f8f744bea40a6`	vba-project	OOXML VBA project: xl/vbaProject.bin	16896 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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