Office (OOXML) / .XLSM malware analysis — malicious · adb2126ab8201d68

MALICIOUS

Office (OOXML) / .XLSM

15.8 KB Created: 2021-03-05 00:14:51 UTC Authoring application: Microsoft Excel 16.0300

MD5: 8deb8023b4cabeaf6cb46a4e4b1ebc25 SHA-1: 09ac5fdc3cad359f1e35f98b15d481ccfe01af30 SHA-256: adb2126ab8201d688d9569a05f08fd1738bf80302d46ef2aa83eb2fc7eb94203

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

This XLSM file contains a Workbook_Open macro that utilizes character-shift decoding to execute a command via the Shell() function. This indicates the document is designed to automatically run a payload upon opening, likely to download and execute a second-stage malicious file.

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` `2000cdd9d34a054ad03c396e9fd7ac8b9fde59b06f99c1fe6919aff3a9093906`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	20360 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` `7c6447cc0dd01651b7832726a1dbeaf479d8c7b37d9270b3635de9dc6018b671`	vba-project	OOXML VBA project: xl/vbaProject.bin	28160 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

Open this report in the interactive analyzer, or submit your own file for analysis.