2026-10-19_55d4c02ba5f9a4581e967fa29f0e3d31_mespinoza

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General

Target
2026-10-19_55d4c02ba5f9a4581e967fa29f0e3d31_mespinoza
Size 1.4MB
Sample261020-yr2b4aet51
SHA256 7c311a23b6caf38a12055032d8aad596d88f382482bde014c82fe48c47df4f91
MD5 55d4c02ba5f9a4581e967fa29f0e3d31
SHA1 bb41c08b34855b63f94fb2e8d05ffcabeb2cca81
SHA512 cfe130f5716a1d64ef4dc94e45e54a20e3c4d1fb66178f0f3183644bbf7d69a47a8c31445bffaf414ea5f17ac0678b8acc9d0ad93cec10b4e8fd60ab7abfc3eb
SSDEEP 24576:JXWob3gYx6YW3CIAGjAXTF3PLNiil4E74rQY9e4:JGw3gi6L35AG8h3PLNxL4rQr
TLSH
T12865BF23990130FAD44DC2F816F3958126A87E56C7217FEB52A0F32239962D06F76F9D
MD5 SHA1 SHA512 SSDEEP TLSH

Score

5^/10

upx

Malware Config

Signatures

UPX packed file 1 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
sample	upx

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
2026-10-19_55d4c02ba5f9a4581e967fa29f0e3d31_mespinoza

File Explorer

2026-10-19_55d4c02ba5f9a4581e967fa29f0e3d31_mespinoza

.exe 1.4MB

2026-10-19_55d4c02ba5f9a4581e967fa29f0e3d31_mespinoza

IMPHASH b36e329c9391665c740f1888a1744814
SHA256 7c311a23b6caf38a12055032d8aad596d88f382482bde014c82fe48c47df4f91
MD5 55d4c02ba5f9a4581e967fa29f0e3d31
SHA1 bb41c08b34855b63f94fb2e8d05ffcabeb2cca81
SHA512 cfe130f5716a1d64ef4dc94e45e54a20e3c4d1fb66178f0f3183644bbf7d69a47a8c31445bffaf414ea5f17ac0678b8acc9d0ad93cec10b4e8fd60ab7abfc3eb
SSDEEP 24576:JXWob3gYx6YW3CIAGjAXTF3PLNiil4E74rQY9e4:JGw3gi6L35AG8h3PLNxL4rQr
TLSH
T12865BF23990130FAD44DC2F816F3958126A87E56C7217FEB52A0F32239962D06F76F9D
MD5 SHA1 SHA512 SSDEEP TLSH

windows:6 windows x64 arch:x64

UPX packed file

Detects executables packed with UPX/modified UPX open source packer.

upx
Unsigned PE

Checks for missing Authenticode signature.

Minor OS version

Major OS version

Entry point

348368

Magic Number

523

Subsystem

IMAGE_SUBSYSTEM_WINDOWS_CUI

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE IMAGE_DLLCHARACTERISTICS_NX_COMPAT IMAGE_DLLCHARACTERISTICS_GUARD_CF IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE IMAGE_FILE_LARGE_ADDRESS_AWARE

PDB paths

z:\task_1581954009\build\src\obj-firefox\toolkit\crashreporter\minidump-analyzer\minidump-analyzer.pdb

mozglue

??2@YAPEAX_K@Z ??3@YAXPEAX@Z ??3@YAXPEAX_K@Z ?DllBlocklist_SetBasicDllServices@@YAXPEAVDllServicesBase@detail@glue@mozilla@@@Z ?DllBlocklist_SetFullDllServices@@YAXPEAVDllServicesBase@detail@glue@mozilla@@@Z calloc free malloc moz_xmalloc

dbghelp

ImageRvaToVa

imagehlp

ImageLoad ImageUnload

msvcp140

??0?$basic_iostream@DU?$char_traits@D@std@@@std@@QEAA@PEAV?$basic_streambuf@DU?$char_traits@D@std@@@1@@Z ??0?$basic_streambuf@DU?$char_traits@D@std@@@std@@IEAA@XZ ??0_Lockit@std@@QEAA@H@Z ??0ios_base@std@@IEAA@XZ ??1?$basic_streambuf@DU?$char_traits@D@std@@@std@@UEAA@XZ ??1_Lockit@std@@QEAA@XZ ??1ios_base@std@@UEAA@XZ ??5?$basic_istream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@AEAI@Z ??5?$basic_istream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@AEAN@Z ??5?$basic_istream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@AEA_K@Z ??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@H@Z ??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@I@Z ??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@J@Z ??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@PEAV?$basic_streambuf@DU?$char_traits@D@std@@@1@@Z ??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@_K@Z ??Bid@locale@std@@QEAA_KXZ ?_Fiopen@std@@YAPEAU_iobuf@@PEBDHH@Z ?_Fiopen@std@@YAPEAU_iobuf@@PEB_WHH@Z ?_Getcat@?$codecvt@DDU_Mbstatet@@@std@@SA_KPEAPEBVfacet@locale@2@PEBV42@@Z ?_Getcat@?$ctype@D@std@@SA_KPEAPEBVfacet@locale@2@PEBV42@@Z ?_Getgloballocale@locale@std@@CAPEAV_Locimp@12@XZ ?_Ipfx@?$basic_istream@DU?$char_traits@D@std@@@std@@QEAA_N_N@Z ?_Lock@?$basic_streambuf@DU?$char_traits@D@std@@@std@@UEAAXXZ ?_Osfx@?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAXXZ ?_Unlock@?$basic_streambuf@DU?$char_traits@D@std@@@std@@UEAAXXZ ?_Xbad_alloc@std@@YAXXZ ?_Xlength_error@std@@YAXPEBD@Z ?_Xout_of_range@std@@YAXPEBD@Z ?cerr@std@@3V?$basic_ostream@DU?$char_traits@D@std@@@1@A ?clear@?$basic_ios@DU?$char_traits@D@std@@@std@@QEAAXH_N@Z ?fail@ios_base@std@@QEBA_NXZ ?flush@?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV12@XZ ?get@?$basic_istream@DU?$char_traits@D@std@@@std@@QEAAHXZ ?getloc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QEBA?AVlocale@2@XZ ?getloc@ios_base@std@@QEBA?AVlocale@2@XZ ?good@ios_base@std@@QEBA_NXZ ?id@?$codecvt@DDU_Mbstatet@@@std@@2V0locale@2@A ?id@?$ctype@D@std@@2V0locale@2@A ?imbue@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MEAAXAEBVlocale@2@@Z ?init@?$basic_ios@DU?$char_traits@D@std@@@std@@IEAAXPEAV?$basic_streambuf@DU?$char_traits@D@std@@@2@_N@Z ?peek@?$basic_istream@DU?$char_traits@D@std@@@std@@QEAAHXZ ?put@?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV12@D@Z ?read@?$basic_istream@DU?$char_traits@D@std@@@std@@QEAAAEAV12@PEAD_J@Z ?seekg@?$basic_istream@DU?$char_traits@D@std@@@std@@QEAAAEAV12@_JH@Z ?setbuf@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MEAAPEAV12@PEAD_J@Z ?sgetc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QEAAHXZ ?showmanyc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MEAA_JXZ ?snextc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QEAAHXZ ?sputc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QEAAHD@Z ?sync@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MEAAHXZ ?tellg@?$basic_istream@DU?$char_traits@D@std@@@std@@QEAA?AV?$fpos@U_Mbstatet@@@2@XZ ?uflow@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MEAAHXZ ?widen@?$basic_ios@DU?$char_traits@D@std@@@std@@QEBADD@Z ?xsgetn@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MEAA_JPEAD_J@Z ?xsputn@?$basic_streambuf@DU?$char_traits@D@std@@@std@@MEAA_JPEBD_J@Z

kernel32

CloseHandle CreateEventW DeleteCriticalSection EnterCriticalSection GetCurrentProcess GetCurrentProcessId GetCurrentThreadId GetModuleHandleW GetProcAddress GetSystemTimeAsFileTime InitializeCriticalSectionAndSpinCount InitializeSListHead IsDebuggerPresent IsProcessorFeaturePresent LeaveCriticalSection MultiByteToWideChar QueryPerformanceCounter ResetEvent RtlCaptureContext RtlLookupFunctionEntry RtlVirtualUnwind SetEvent SetPriorityClass SetUnhandledExceptionFilter TerminateProcess UnhandledExceptionFilter WaitForSingleObjectEx WideCharToMultiByte

vcruntime140

_CxxThrowException __C_specific_handler __CxxFrameHandler3 __std_terminate memchr memcmp memcpy memmove memset

api-ms-win-crt-stdio-l1-1-0

__acrt_iob_func __p__commode __stdio_common_vfprintf __stdio_common_vsprintf __stdio_common_vsscanf _fseeki64 _get_stream_buffer_pointers _set_fmode fclose fflush fgetc fgetpos fputc fread fsetpos fwrite putchar puts setvbuf ungetc

api-ms-win-crt-math-l1-1-0

__setusermatherr _dtest modf

api-ms-win-crt-runtime-l1-1-0

__p___argc __p___wargv _c_exit _cexit _configure_wide_argv _crt_atexit _errno _exit _get_initial_wide_environment _initialize_onexit_table _initialize_wide_environment _initterm _initterm_e _invalid_parameter_noinfo_noreturn _register_onexit_function _register_thread_local_exe_atexit_callback _seh_filter_exe _set_app_type abort exit strerror terminate

api-ms-win-crt-time-l1-1-0

_localtime64_s _time64 strftime

api-ms-win-crt-filesystem-l1-1-0

_lock_file _unlock_file

api-ms-win-crt-string-l1-1-0

isprint strcmp strlen strncat strncpy wcscmp wcslen

api-ms-win-crt-locale-l1-1-0

_configthreadlocale

api-ms-win-crt-heap-l1-1-0

_set_new_mode

Name

.text

Size

338KB

Virtual Size

337KB

Characteristics

IMAGE_SCN_CNT_CODE IMAGE_SCN_MEM_EXECUTE IMAGE_SCN_MEM_READ

Name

.rdata

Size

104KB

Virtual Size

103KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

.data

Size

203KB

Virtual Size

205KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

.pdata

Size

6KB

Virtual Size

5KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

.00cfg

Size

512B

Virtual Size

16B

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

.tls

Size

512B

Virtual Size

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

.rsrc

Size

1KB

Virtual Size

1KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

UPX1

Size

763KB

Virtual Size

764KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_EXECUTE IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Sharing

General

Malware Config

Signatures

File Explorer

2026-10-19_55d4c02ba5f9a4581e967fa29f0e3d31_mespinoza

mozglue

dbghelp

imagehlp

msvcp140

kernel32

vcruntime140

api-ms-win-crt-stdio-l1-1-0

api-ms-win-crt-math-l1-1-0

api-ms-win-crt-runtime-l1-1-0

api-ms-win-crt-time-l1-1-0

api-ms-win-crt-filesystem-l1-1-0

api-ms-win-crt-string-l1-1-0

api-ms-win-crt-locale-l1-1-0

api-ms-win-crt-heap-l1-1-0

generic