Analysis
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max time kernel
150s -
max time network
149s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
02-01-2025 05:45
Behavioral task
behavioral1
Sample
letter.htm.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
letter.htm.exe
Resource
win10v2004-20241007-en
General
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Target
letter.htm.exe
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Size
28KB
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MD5
14e6f2c43d8221938a964eeef9dd16f8
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SHA1
47c82ca2d8c4566d7847311dc7ce1756a9705caf
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SHA256
a095cd103481eb234975df1ee85eb2af7cd07e7eab865dda7795305b395b5dc7
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SHA512
cf7240689eb2011c921e0209377ca75dba2c4baf912f2d67f39329b8bf3358ddbe4ab0ae15a7734ddedac1893cb8acf4448f92604e1822a5bfe92db9acf0a9c6
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SSDEEP
384:1vxBbK26lj5Id8SpHx9jLhsznnVxA1WmP5w7GGCJlqqwMyNphe:Dv8IRRdsxq1DjJcqf4o
Malware Config
Signatures
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Detects MyDoom family 5 IoCs
resource yara_rule behavioral2/memory/3148-13-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral2/memory/3148-56-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral2/memory/3148-102-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral2/memory/3148-171-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral2/memory/3148-182-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom -
Mydoom family
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Executes dropped EXE 1 IoCs
pid Process 1592 services.exe -
Adds Run key to start application 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\JavaVM = "C:\\Windows\\java.exe" letter.htm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Services = "C:\\Windows\\services.exe" services.exe -
resource yara_rule behavioral2/memory/3148-0-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/files/0x0008000000023c8e-4.dat upx behavioral2/memory/1592-6-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/3148-13-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/1592-15-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/1592-16-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/1592-21-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/1592-26-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/1592-28-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/1592-33-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/1592-38-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/1592-40-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/1592-45-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/1592-50-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/1592-52-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/3148-56-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/1592-57-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/files/0x0003000000000709-62.dat upx behavioral2/memory/3148-102-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/1592-103-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/3148-171-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/1592-172-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral2/memory/3148-182-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/1592-183-0x0000000000400000-0x0000000000408000-memory.dmp upx -
Drops file in Windows directory 3 IoCs
description ioc Process File created C:\Windows\services.exe letter.htm.exe File opened for modification C:\Windows\java.exe letter.htm.exe File created C:\Windows\java.exe letter.htm.exe -
System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language letter.htm.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language services.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 3148 wrote to memory of 1592 3148 letter.htm.exe 83 PID 3148 wrote to memory of 1592 3148 letter.htm.exe 83 PID 3148 wrote to memory of 1592 3148 letter.htm.exe 83
Processes
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C:\Users\Admin\AppData\Local\Temp\letter.htm.exe"C:\Users\Admin\AppData\Local\Temp\letter.htm.exe"1⤵
- Adds Run key to start application
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3148 -
C:\Windows\services.exe"C:\Windows\services.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- System Location Discovery: System Language Discovery
PID:1592
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
25B
MD58ba61a16b71609a08bfa35bc213fce49
SHA18374dddcc6b2ede14b0ea00a5870a11b57ced33f
SHA2566aa63394c1f5e705b1e89c55ff19eed71957e735c3831a845ff62f74824e13f1
SHA5125855f5b2a78877f7a27ff92eaaa900d81d02486e6e2ea81d80b6f6cf1fe254350444980017e00cdeecdd3c67b86e7acc90cd2d77f06210bdd1d7b1a71d262df1
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Filesize
28KB
MD511ab27336c92689efffd21be5e788f31
SHA1f9fa7f4aa91d9004e42e745aa0df3b633e163e95
SHA256476c6b43a4fe7b11237ef8d4fdd8147c387b614effb20c84ff36dc0bf51dc04f
SHA51287fd1e2e35ac6e6824948aa0ee67314cd647fda2ff5b54acd8be5a848a59c4c750fd5f3271c0ccee6bdfe7c51d811e39e9d936cc76ff92f1fd74f40893ff43e5
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Filesize
1KB
MD56b2db775883c1cf5181e0341df21639b
SHA118b9541de31a9a5816aeb5bfa966aa310622de72
SHA256dffc8202b2bfc66e06947f500ab0972878ff93ccc80055cb832b169aa9b14e24
SHA5121e44809f8b44665dbfadb49cd89b061e8b2712fbc555b76a56f0bde6c047279e1bf4a5b9f360dba6abbecf3028495bd903349abedbf016c2e42741773b8be129
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Filesize
1KB
MD54455a6ec74649183ba4de7f57a44f702
SHA156e166f94205a5bd8e044f93bfb24c289d8a0880
SHA256e2ddb94b04d8347ad6ffd1ebeecb4b48b804d082258d163d54c8adcbda2a2664
SHA5126051d77d74001fa1158f451e268096ade917acce193ec72b71771d352a56c0cf15a7ee66b79051b72ad1696776968d5f52aa9e87a3e96185e9274c41dc125d62
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Filesize
8KB
MD5b0fe74719b1b647e2056641931907f4a
SHA1e858c206d2d1542a79936cb00d85da853bfc95e2
SHA256bf316f51d0c345d61eaee3940791b64e81f676e3bca42bad61073227bee6653c
SHA5129c82e88264696d0dadef9c0442ad8d1183e48f0fb355a4fc9bf4fa5db4e27745039f98b1fd1febff620a5ded6dd493227f00d7d2e74b19757685aa8655f921c2