Office (OOXML) / .XLSM malware analysis — malicious · cdc866753e7d7865

MALICIOUS

Office (OOXML) / .XLSM

328.4 KB Created: 2021-07-26 11:42:26 UTC Authoring application: Microsoft Excel 12.0000

MD5: 4dfc77e45068635df70a32fd5bcdeb01 SHA-1: 01e6f96db1fc9adfb6ef49beed0abaf6a12eab3a SHA-256: cdc866753e7d7865e67e31047a60468f6c7eb80290df4c4e16d3697eb8db12b6

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an XLSM file containing a Workbook_Open macro. This macro is designed to construct a path using environment variables and a hardcoded string, then write obfuscated data to this path. Finally, it uses the Shell() function to execute the constructed path, likely downloading and running a second-stage payload. The obfuscation within the macro makes it difficult to determine the exact nature of the payload or its destination without further dynamic analysis.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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` `f4cc2a024552290e7be4d18b28fd45c7a35909edbbdc6e74193592874c5137ea`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1052 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` `0325d9d5e0c15a9d70b23d160317df3721f625cbee013734ccf7c4a4697b8602`	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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