Firefox Installer[.]exe

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General

Target
Firefox Installer.exe
Size 492KB
Sample260731-nxncbasbla
SHA256 0a83055a65099fad3eafb1a7fdefa17d2855026207f7ce8abdaa54e97f07ad5b
MD5 61f8438c5668c0f4c2b0074ffe481cf5
SHA1 3ecfe2537e05155695f62ae980a1711f36ff626e
SHA512 9a71f6be59a552eb74c5cb206e3cf4daa43adc423a0d7ed8029a567a913676dbe6418879710592675332b00c677d260b47c9db91c219f34f5dc4372e61633975
SSDEEP 12288:zMROxTfOnMmXp3L7vL6yk547x4MLWGEAJgq8fn0qz/zES:wIxinvXp3PvL6yLLSAviR
TLSH
T1F1B423F19EA8F089C553E8352EFD821F8F9D7E8911E0C9E39032BA917F475436A56213
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
unpack001/out.upx

File Explorer

Firefox Installer.exe

.exe 492KB
out.upx

.exe 188KB

Firefox Installer.exe

SHA256 0a83055a65099fad3eafb1a7fdefa17d2855026207f7ce8abdaa54e97f07ad5b
MD5 61f8438c5668c0f4c2b0074ffe481cf5
SHA1 3ecfe2537e05155695f62ae980a1711f36ff626e
SHA512 9a71f6be59a552eb74c5cb206e3cf4daa43adc423a0d7ed8029a567a913676dbe6418879710592675332b00c677d260b47c9db91c219f34f5dc4372e61633975
SSDEEP 12288:zMROxTfOnMmXp3L7vL6yk547x4MLWGEAJgq8fn0qz/zES:wIxinvXp3PvL6yLLSAviR
TLSH
T1F1B423F19EA8F089C553E8352EFD821F8F9D7E8911E0C9E39032BA917F475436A56213
MD5 SHA1 SHA512 SSDEEP TLSH

windows:4 windows x86 arch:x86

UPX packed file

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

upx

Digest

dd:2f:c6:1d:cb:3e:a2:59:ed:ba:82:7b:c9:e7:4e:9f:94:41:65:80:b0:65:04:78:10:bd:1f:16:52:ea:c2:b9

Digest Algorithm

sha256

PE Digests Matches

Trusted

Signing Certificate

CN=Mozilla Corporation,OU=Firefox Engineering Operations,O=Mozilla Corporation,L=San Francisco,ST=California,C=US

Chains

Jul 27, 2026

CN=Mozilla Corporation,OU=Firefox Engineering Operations,O=Mozilla Corporation,L=San Francisco,ST=California,C=US

CN=DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1,O=DigiCert\, Inc.,C=US

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

CN=Mozilla Corporation,OU=Firefox Engineering Operations,O=Mozilla Corporation,L=San Francisco,ST=California,C=US

CN=DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1,O=DigiCert\, Inc.,C=US

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

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

Subject

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

Serial Number

01:24:0a:fb:1e:38:0b:8a:16:f1:4b:71:9d:f4:d3:c0

Issuer

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

Key Usages

KeyUsageDigitalSignature, KeyUsageCertSign, KeyUsageCRLSign

Ext Key Usages

ExtKeyUsageTimeStamping

Revocation Status

Not revoked

Timespan

Jun 9, 2022 - Nov 9, 2031

Subject

CN=DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1,O=DigiCert\, Inc.,C=US

Serial Number

08:ad:40:b2:60:d2:9c:4c:9f:5e:cd:a9:bd:93:ae:d9

Issuer

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

Key Usages

KeyUsageDigitalSignature, KeyUsageCertSign, KeyUsageCRLSign

Ext Key Usages

ExtKeyUsageCodeSigning

Revocation Status

Not revoked

Timespan

Apr 29, 2021 - Apr 28, 2036

Subject

CN=Dummy

Serial Number

7e:89:b9:df:00:6b:d1:aa:4c:48:d8:65:03:96:34:ca

Issuer

CN=Dummy

Key Usages

KeyUsageDigitalSignature

Ext Key Usages

ExtKeyUsageCodeSigning

Timespan

Jan 1, 2013 - Jan 2, 2013

Subject

CN=Mozilla Corporation,OU=Firefox Engineering Operations,O=Mozilla Corporation,L=San Francisco,ST=California,C=US

Serial Number

0f:0e:f7:c2:d8:19:27:3e:8c:13:f0:16:d2:e0:9b:25

Issuer

CN=DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1,O=DigiCert\, Inc.,C=US

Key Usages

KeyUsageDigitalSignature

Ext Key Usages

ExtKeyUsageCodeSigning

Revocation Status

Not revoked

Timespan

Jan 9, 2025 - Jan 8, 2027

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

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 SHA256 RSA4096 Timestamp Responder 2025 1,O=DigiCert\, Inc.,C=US

Serial Number

0a:80:ef:18:4b:8d:f1:05:82:d1:c4:76:a7:95:74:68

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

Jun 4, 2025 - Sep 3, 2036

Minor OS version

Major OS version

Entry point

216992

Magic Number

267

Subsystem

IMAGE_SUBSYSTEM_WINDOWS_GUI

DLL Characteristics

File Characteristics

IMAGE_FILE_RELOCS_STRIPPED IMAGE_FILE_EXECUTABLE_IMAGE IMAGE_FILE_LINE_NUMS_STRIPPED IMAGE_FILE_LOCAL_SYMS_STRIPPED IMAGE_FILE_32BIT_MACHINE

PDB paths

out.upx

SHA256 d010265be33ead064c15604dcf5e90bf9f0608585eb9a04171294941e14a95a2
MD5 2a779706848199e597315870c4b077d4
SHA1 48c674022d55ddb45d741c9c901204471ac973c7
SHA512 b092be4b0276c4fdc95ffa9635ae7be9b7babb0d3aa99bf9b6e17b8d53fc3351b1e0934ffc19639da89e580f028c5e9c38a2e78f84a071ddb546e619cf41889c
SSDEEP 3072:488bdXF8FtO5dyzEAKZ/hx7c3unn+b09CIWncYodntK+C7VieM3SFZNt9ckP:XsdXFryQfP7nn+b0AvncfdwX3MmIO
TLSH
T14414AE323AD5C8FAD2532271CB49B7EAE1FADB180814493323142E5D7FBE846931D61E
MD5 SHA1 SHA512 SSDEEP TLSH

windows:4 windows x86 arch:x86

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

106406

Magic Number

267

Subsystem

IMAGE_SUBSYSTEM_WINDOWS_GUI

DLL Characteristics

File Characteristics

IMAGE_FILE_RELOCS_STRIPPED IMAGE_FILE_EXECUTABLE_IMAGE IMAGE_FILE_LINE_NUMS_STRIPPED IMAGE_FILE_LOCAL_SYMS_STRIPPED IMAGE_FILE_32BIT_MACHINE

PDB paths

Firefox Installer.exe

generic

out.upx

generic