Office (OOXML) / .XLSX malware analysis — malicious · 7897d18b47457081

MALICIOUS

Office (OOXML) / .XLSX

19.3 KB

MD5: 460d13128b15da85fd522c24e20255d6 SHA-1: ee990a2396bc73aeafc946f93e948630f0f9e36f SHA-256: 7897d18b47457081323af388c876afba93df6bb3fd4c0450821bdf0fcae36d7e

276 Risk Score

Malware Insights

MITRE ATT&CK

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

The OOXML file contains a Workbook_Open macro that utilizes WScript.Shell and CreateObject to execute commands. This macro is designed to download and execute a second-stage payload from the URL http://179.43.140.150/shtq/fack.jpg. The use of Shell() and WScript.Shell indicates a clear intent to run arbitrary code.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
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.

URL http://179.43.140.150/shtq/fack.jpg
VBA project inside OOXML medium OOXML_VBA

Malformed OOXML local headers contain vbaProject.bin — VBA macros present
Malformed OOXML package with recoverable local headers low OOXML_MALFORMED_ZIP_LOCAL_HEADERS

The OOXML ZIP central directory is invalid or missing, but local file headers expose a recoverable Office package. This can create parser divergence between tolerant Office/ZIP readers and scanners that rely only on the central directory.
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
`vbaProject_00.bin` `6288dd136d9cfc1b0f11138c251be40e7c0b8ae3ac584f6e121f54af09ca33b5`	vba-project	Malformed OOXML local-header VBA project: xl/vbaProject.bin	25088 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`macros.bas` `144ea9080fa24928e5ce8350a740c3fbd8bc994ad31b3f932de947cbee002302`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from malformed OOXML local headers)	7984 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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