Office (OLE) / .DOC malware analysis — malicious · a0eee9a436ca8003

MALICIOUS

Office (OLE) / .DOC

57.0 KB First seen: 2022-07-05

MD5: 545fc148207c6369d7cd08395c181beb SHA-1: a9286a87f8561e3f8aae631643bfff2ccd4ada1e SHA-256: a0eee9a436ca8003840d27a69b150fe8e55e7d86ad0f2e238caadd1fdc51ecce

328 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The critical heuristic 'OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER' indicates the presence of an obfuscated auto-executing VBA loader. The Workbook_Open macro is present and calls functions that appear to decode strings and then use VBA's Shell() function to execute a file. The decoded string for the executable appears to be 'C:\MyOx.exe' which is likely a second-stage payload downloaded from an environment variable. The ClamAV detection name 'Xls.Malware.Valyria-10036513-0' further supports the malicious nature of the file.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
ClamAV: Xls.Malware.Valyria-10036513-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10036513-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `a9d33bd1db094d8c00dabc8e631a378588845e837421649309301d6c7aca92f9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22722 bytes

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