Office (OOXML) / .XLSM malware analysis — malicious · 5028b36686a9f845

MALICIOUS

Office (OOXML) / .XLSM

437.3 KB Created: 2021-07-28 10:37:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 0de03c55577478d9fc235a519f77bc9f SHA-1: 17129a7545037e9554afe7538e72ba817ea0d571 SHA-256: 5028b36686a9f8459104051fad79bc01c2500f6dac581ebea117f9eff3430cc8

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an XLSM file containing a Workbook_Open macro, which is a common technique for initial execution. The macro constructs a command by concatenating strings from cell values and environment variables to create a path and filename for a second-stage payload, which is then executed. Specifically, it appears to write to and execute a file at 'C:\Users\Public\IAccessible2Proxy.exe' using 'cmd.exe'. The use of CreateObject and Environ() calls further supports this malicious intent.

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` `d4c9f2fafa43643471d6fc97ffaa84282815e939f1b935e24d93c9affa09f65f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1229 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` `9fd3cc32e75527b355a32322e1afc587ea840fefb2a6c6a83e6df7bd7e614a94`	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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