Office (OOXML) / .XLSM malware analysis — malicious · 5396f43462f60193

MALICIOUS

Office (OOXML) / .XLSM

439.2 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000

MD5: 86f35bf1e92f2395863732157fb0e106 SHA-1: 4a63f4807da75dde774a331b1522c2eec877e7b4 SHA-256: 5396f43462f60193a3c91e01d7a44a0e62f545f1c86b11df4a51b59d24db83c3

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains a Workbook_Open macro that is designed to execute a command. The macro reconstructs a path to a file, likely 'C:\Users\Public\IAccessible2Proxy.exe', by concatenating environment variables and hardcoded strings. It then writes data to this file and executes it. The use of CreateObject and Environ() calls, along with the Workbook_Open trigger, are indicative of a downloader or initial execution stage. The reconstructed command appears to be 'C:\Users\Public\IAccessible2Proxy.exe', which is likely a second-stage payload.

Heuristics 5

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` `92adf22754e90af2a4e086f63ed2dd169359b0226b105674a65add3829db4b57`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1102 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` `c3f8f1a46eb5a8bf19e6d7113db337aaac0dbaf5f873c0049e31e02711e55a7c`	vba-project	OOXML VBA project: xl/vbaProject.bin	9216 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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