Office (OOXML) / .XLSM malware analysis — malicious · df7e4b16f900d23e

MALICIOUS

Office (OOXML) / .XLSM

331.9 KB Created: 2019-06-17 17:48:55 UTC Authoring application: Microsoft Excel 12.0000

MD5: b7cf2052ee1681f71c9eeea22d44e3e5 SHA-1: 48e3aa45c9929926e31a0ef938da61345ea1b922 SHA-256: df7e4b16f900d23eb532fbf32df859b7bb554ebf738efc81da09642d873e523a

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an XLSM file containing a Workbook_Open macro. This macro utilizes the Shell() function to execute a dynamically constructed command. The command appears to be built from environment variables and hardcoded strings, suggesting it aims to download and execute a second-stage payload. The use of Environ() and Shell() calls are strong indicators of malicious intent.

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` `e440b7ec96a37ddd6b2fbe2c6ad0ce603d039da00c6290a8d5113aeebe40aef8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1080 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` `8514408a81a7d757531cbf7dfd700294e3b32160d920f0b81be71d58b23513af`	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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