NULLSUB[.]exe | Triage™

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General

Target
NULLSUB.exe
Size 1.6MB
Sample261107-taqrtacz9v
SHA256 880627b8212d9125e6ef18b1f1ea7ac91507c0f49eecad2ff301a666a4d56d51
MD5 2661f0e3c12e7994e62b9145f05980c7
SHA1 ba4a988f8e76164cedc649585ed5d1088f1970d4
SHA512 357400f57472bd9fc80828cc99b502a508c823ab864c7b850c40e0fcba5abf0259ddb353253580a046dfac3b14f7b13a0498f04a303e305c616e61670d77ea53
SSDEEP 24576:5ZDbBW6TgcDu82VMcxdecBZgnvfYCNByNgjDThfC9Q+iYQA:5ZDb/ZkitEgnfjxb+9
TLSH
T15F8502A1F8C59441C82FD231D643EE3123376FBEB9B188CA058C7786B2979414F6D96B
MD5 SHA1 SHA512 SSDEEP TLSH

Score

3^/10

Malware Config

Signatures

Untrusted Codesign Signers 1 IoCs

Codesigned file was signed by an untrusted entity.

resource
NULLSUB.exe

File Explorer

NULLSUB.exe

.exe 1.6MB

NULLSUB.exe

IMPHASH 32728a394d0b2ddb601cecc57e0d417b
SHA256 880627b8212d9125e6ef18b1f1ea7ac91507c0f49eecad2ff301a666a4d56d51
MD5 2661f0e3c12e7994e62b9145f05980c7
SHA1 ba4a988f8e76164cedc649585ed5d1088f1970d4
SHA512 357400f57472bd9fc80828cc99b502a508c823ab864c7b850c40e0fcba5abf0259ddb353253580a046dfac3b14f7b13a0498f04a303e305c616e61670d77ea53
SSDEEP 24576:5ZDbBW6TgcDu82VMcxdecBZgnvfYCNByNgjDThfC9Q+iYQA:5ZDb/ZkitEgnfjxb+9
TLSH
T15F8502A1F8C59441C82FD231D643EE3123376FBEB9B188CA058C7786B2979414F6D96B
MD5 SHA1 SHA512 SSDEEP TLSH

Untrusted Codesign Signers

Codesigned file was signed by an untrusted entity.

PE Signature issue

Digest

3c:a2:8a:93:7a:f1:cd:e9:06:eb:d7:81:67:be:f1:34:fa:60:b6:6a:96:b7:81:1e:31:81:35:81:f0:a2:bd:f2

Digest Algorithm

sha256

PE Digests Matches

Trusted

Not trusted

Signing Certificate

CN=TechSoft Solutions,O=TechSoft Solutions

Chains

Nov 7, 2026

CN=TechSoft Solutions,O=TechSoft Solutions

Subject

CN=TechSoft Solutions,O=TechSoft Solutions

Serial Number

29:13:de:c7:2b:8a:9a:a8:41:8a:59:0e:07:a0:26:7d

Issuer

CN=TechSoft Solutions,O=TechSoft Solutions

Key Usages

KeyUsageDigitalSignature

Ext Key Usages

ExtKeyUsageCodeSigning

Timespan

Nov 7, 2026 - Nov 7, 2027

Subject

CN=DigiCert SHA256 RSA4096 Timestamp Responder 2026 1,O=DigiCert\, Inc.,C=US

Serial Number

08:4f:dc:33:4f:7e:45:4e:db:c3:0f:8f:f9:92:18:35

Issuer

CN=DigiCert Trusted G4 TimeStamping RSA4096 SHA256 2025 CA1,O=DigiCert\, Inc.,C=US

Key Usages

KeyUsageDigitalSignature

Ext Key Usages

ExtKeyUsageTimeStamping

Revocation Status

Not revoked

Timespan

Aug 5, 2026 - Nov 4, 2037

Subject

CN=DigiCert Trusted G4 TimeStamping RSA4096 SHA256 2025 CA1,O=DigiCert\, Inc.,C=US

Serial Number

0d:c7:ac:57:05:ff:21:99:2e:40:43:22:0c:3a:49:86

Issuer

CN=DigiCert Trusted Root G4,OU=www.digicert.com,O=DigiCert Inc,C=US

Key Usages

KeyUsageDigitalSignature, KeyUsageCertSign, KeyUsageCRLSign

Ext Key Usages

ExtKeyUsageTimeStamping

Revocation Status

Not revoked

Timespan

May 7, 2025 - Jan 14, 2038

Subject

CN=DigiCert Trusted Root G4,OU=www.digicert.com,O=DigiCert Inc,C=US

Serial Number

0e:9b:18:8e:f9:d0:2d:e7:ef:db:50:e2:08:40:18:5a

Issuer

CN=DigiCert Assured ID Root CA,OU=www.digicert.com,O=DigiCert Inc,C=US

Key Usages

KeyUsageDigitalSignature, KeyUsageCertSign, KeyUsageCRLSign

Revocation Status

Not revoked

Timespan

Aug 1, 2022 - Nov 9, 2031

Minor OS version

Major OS version

520

Entry point

4144

Magic Number

523

Subsystem

IMAGE_SUBSYSTEM_WINDOWS_GUI

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE IMAGE_DLLCHARACTERISTICS_NX_COMPAT

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE IMAGE_FILE_LINE_NUMS_STRIPPED IMAGE_FILE_LOCAL_SYMS_STRIPPED IMAGE_FILE_LARGE_ADDRESS_AWARE IMAGE_FILE_DEBUG_STRIPPED

PDB paths

advapi32

AllocateAndInitializeSid CheckTokenMembership FreeSid RegCloseKey RegCreateKeyExW RegDeleteTreeW RegSetValueExW

iphlpapi

GetAdaptersAddresses

kernel32

AddVectoredExceptionHandler CheckRemoteDebuggerPresent CloseHandle CreateFileW CreateProcessW CreateThread CreateToolhelp32Snapshot DeleteCriticalSection DeleteFileW EnterCriticalSection ExitProcess FindResourceW FlushInstructionCache FreeLibrary GetACP GetCurrentProcess GetCurrentThread GetFileAttributesA GetLastError GetModuleFileNameW GetModuleHandleA GetModuleHandleW GetNativeSystemInfo GetProcAddress GetStartupInfoA GetSystemDirectoryA GetSystemFirmwareTable GetSystemInfo GetTempPathW GetThreadContext GetTickCount64 GetVolumeInformationW GlobalMemoryStatusEx InitializeCriticalSection IsDBCSLeadByte IsDebuggerPresent LeaveCriticalSection LoadLibraryA LoadResource LockResource OutputDebugStringA Process32First Process32Next SetUnhandledExceptionFilter SizeofResource Sleep TlsGetValue VirtualAlloc VirtualFree VirtualProtect VirtualQuery WaitForSingleObject WriteFile

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

mbrtowc wcrtomb

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

__p__environ getenv

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

_lock_file _unlock_file

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

_set_new_mode calloc free malloc

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

_configthreadlocale localeconv

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

__setusermatherr

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

__C_specific_handler memcmp memcpy

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

__p___argc __p___argv __p__acmdln _cexit _configure_narrow_argv _crt_atexit _errno _exit _initialize_narrow_environment _set_app_type _initterm _initterm_e _set_invalid_parameter_handler abort exit signal strerror

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

__acrt_iob_func __p__commode __p__fmode __stdio_common_vfprintf __stdio_common_vfwprintf fflush fputc fputwc setvbuf

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

memset strcpy strlen strncmp strnlen wcscat wcscpy wcslen wcsnlen

shell32

ShellExecuteW

user32

FindWindowA

Name

tEtSVs9L

Size

69KB

Virtual Size

69KB

Characteristics

IMAGE_SCN_CNT_CODE IMAGE_SCN_MEM_EXECUTE IMAGE_SCN_MEM_READ

Name

2gfhKGxP

Size

512B

Virtual Size

224B

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

620tdVfg

Size

6KB

Virtual Size

6KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

IzpMUHUV

Size

512B

Virtual Size

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

789FbD70

Size

2KB

Virtual Size

1KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

TBogfGRC

Size

2KB

Virtual Size

1KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

k5T7Zw9R

Size

Virtual Size

3KB

Characteristics

IMAGE_SCN_CNT_UNINITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

s9yp08TC

Size

5KB

Virtual Size

5KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

6P8K4jQl

Size

512B

Virtual Size

16B

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

CVvqZrOJ

Size

1.6MB

Virtual Size

1.6MB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

O4V6N1CB

Size

512B

Virtual Size

248B

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_DISCARDABLE IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

File Explorer

NULLSUB.exe

PE Signature issue

advapi32

iphlpapi

kernel32

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

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

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

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

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

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

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

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

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

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

shell32

user32

generic