Office (OOXML) / .XLSM malware analysis — malicious · c6ec076b4821de40

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 84dfcbf8006b609714e14ae85d94baa4 SHA-1: 3cbd6c0a05e587d0ebcb46c125bcb9a31814865c SHA-256: c6ec076b4821de409d2fa1416b8419635421b732960a62e62bac6161040ab342

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristic 'OLE_VBA_SHELL' and the presence of a 'Workbook_Open' macro indicate that this XLSM file is designed to execute arbitrary code upon opening. The VBA script within 'macros.bas' attempts to construct a command using environment variables and then execute it via the Shell() function, strongly suggesting it downloads and executes a second-stage payload. The obfuscated nature of the script and the use of environment variables for constructing the execution path are common techniques for malware delivery.

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` `e3355529d5af5edf5e5b4e5529d244c15381074f3671107b0a947a2b68cabde6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1072 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` `0426f42ddcb7874bb47a4e45c988250ddcb437999caa523e5a41e65df9a08c50`	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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