Xls.Dropper.Agent-7645311-0 Office (OLE) / .XLS malware analysis — malicious · 3003135b30453683

MALICIOUS

Office (OLE) / .XLS

14.5 KB

MD5: 8543239aa29547651c60511eb835f480 SHA-1: eae688e5a30d8438f86fd4b5eaa3179e4caadc34 SHA-256: 3003135b30453683d0167fe863f08379525353dff7aeea7a79dc54fb7c2c08a3

320 Risk Score

Malware Insights

Xls.Dropper.Agent-7645311-0 · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The critical OLE_VBA_SHELL and OLE_VBA_ASC_CHR_SHIFT_SHELL heuristics indicate that the VBA macros within this XLS file are designed to execute a command via the Shell() function. The Workbook_Open macro is specifically triggered upon opening the document, suggesting an automated execution flow. The ClamAV detection name further supports its classification as a dropper. The script likely decodes and executes a command to download and run a secondary payload.

Heuristics 7

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.
ClamAV: Xls.Dropper.Agent-7645311-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-7645311-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `010e8d05a2d4ad29a35330f4cc0cb0ba955dda2cbdb312f7836d69caca4d25b9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2615 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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