Office (OOXML) / .XLSX malware analysis — malicious · 45a84e9f8fb9cecb

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: db7e218690fde1ddcb1f8a740029aa54 SHA-1: fc1f4113c100e5dbfc7421bea62c6ffbd05b74e4 SHA-256: 45a84e9f8fb9cecb7021024efdee3fac2516d9836f397c37b96320fb80304601

208 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel document containing VBA macros, with a Workbook_Open macro designed to execute automatically. The script utilizes `CreateObject` to instantiate COM objects and references LOLBins, indicating an attempt to download and execute a payload. Specifically, it writes to a file in the user's profile directory and appears to be setting up a scheduled task via the `Schedule.Service` COM object, suggesting a downloader or backdoor functionality.

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` `6c395de9ee9885828532d96f49dc1dc3a7635d69408400ab8bbd9c82ac432ac6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3754 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` `8fa9497cb8a771f9959d24b92662f31a7f9b5f67d827acf0b3f5ea05f2f7e62d`	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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