Office (OOXML) / .XLSM malware analysis — malicious · ea292749e1698024

MALICIOUS

Office (OOXML) / .XLSM

78.8 KB Created: 2020-05-19 17:33:23 UTC Authoring application: Microsoft Excel 16.0300

MD5: 971ec4c15510cf641b4fc1363f168d4c SHA-1: b2b7c146971029bd9e94e86eb5552832ed4e8046 SHA-256: ea292749e16980249ec7663af3c3cc38f95f060098723db410406e872d2009c6

220 Risk Score

Malware Insights

MITRE ATT&CK

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

The XLSM file contains a Workbook_Open macro that uses character-shift decoding to execute a command via Shell(). This indicates the document is designed to download and run a second-stage payload. The presence of VBA macros and the Workbook_Open auto-execution event are strong indicators of malicious intent.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL

VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `5ff85e141a75b864892cbdc1ab06a8c1372b9627556c8c64d4d1dcb4cf7cb1a4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1624 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` `9259e491eaafa24487a6d1d37cb4bd0de74a7456950fd692ecd133a42a737f8a`	vba-project	OOXML VBA project: xl/vbaProject.bin	15872 bytes

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