Analysis
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max time kernel
150s -
max time network
151s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-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 9 IoCs
resource yara_rule behavioral1/memory/2168-2-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral1/memory/2168-17-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral1/memory/2168-37-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral1/memory/2168-58-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral1/memory/2168-62-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral1/memory/2168-67-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral1/memory/2168-74-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral1/memory/2168-98-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom behavioral1/memory/2168-263-0x0000000000500000-0x0000000000510000-memory.dmp family_mydoom -
Mydoom family
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Executes dropped EXE 1 IoCs
pid Process 2132 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 behavioral1/memory/2168-2-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral1/files/0x0007000000015ec9-7.dat upx behavioral1/memory/2132-11-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2168-4-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2168-17-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral1/memory/2132-20-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2132-21-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2132-26-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2132-31-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2132-33-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2168-37-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral1/memory/2132-38-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2132-43-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/files/0x0005000000004ed7-53.dat upx behavioral1/memory/2168-58-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral1/memory/2132-59-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2168-62-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral1/memory/2132-63-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2168-67-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral1/memory/2132-68-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2132-70-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2168-74-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral1/memory/2132-75-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2132-80-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2168-98-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral1/memory/2132-99-0x0000000000400000-0x0000000000408000-memory.dmp upx behavioral1/memory/2168-263-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral1/memory/2132-264-0x0000000000400000-0x0000000000408000-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 -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8 letter.htm.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8\Blob = 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 letter.htm.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\5FB7EE0633E259DBAD0C4C9AE6D38F1A61C7DC25 letter.htm.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\5FB7EE0633E259DBAD0C4C9AE6D38F1A61C7DC25\Blob = 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 letter.htm.exe -
Suspicious use of WriteProcessMemory 4 IoCs
description pid Process procid_target PID 2168 wrote to memory of 2132 2168 letter.htm.exe 30 PID 2168 wrote to memory of 2132 2168 letter.htm.exe 30 PID 2168 wrote to memory of 2132 2168 letter.htm.exe 30 PID 2168 wrote to memory of 2132 2168 letter.htm.exe 30
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
- Modifies system certificate store
- Suspicious use of WriteProcessMemory
PID:2168 -
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:2132
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize342B
MD58c50aad3a5dcb347af50abb54cdfc5d6
SHA17ddb116573b951e4f69dd357582b45e2a0bf353e
SHA2568e6c12ea6b4e15ea21ae82b7f70da7d790a14caaa990347d3b6277177ebaccb1
SHA512b689b78d1170968e897b045e94dae7f36d7f78b33b3a5c5725a51ed531122a3395f933933384449040295ec765549eebf6c7fa452aea4d649ede08c8de5fc53b
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C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
Filesize342B
MD5147b526867a5bcf8a9c1d94ac4f0efdf
SHA1d9d38d435e015fc21da30382193dbac7f75b092f
SHA25666e1e62ef100d080cdbf8d3f95a064b7402e30c43fddeac167086c5a4284ba5d
SHA512129a902c551a45ab4553cb20cfc5cc966599ca7a7c617510ac1e4ee908fc30dd6f5e143da6f6586337af4532bbfed0a49897fd218c49ad1a9e284c650afb6f40
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C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\EOYL2MRI\search[1].htm
Filesize25B
MD58ba61a16b71609a08bfa35bc213fce49
SHA18374dddcc6b2ede14b0ea00a5870a11b57ced33f
SHA2566aa63394c1f5e705b1e89c55ff19eed71957e735c3831a845ff62f74824e13f1
SHA5125855f5b2a78877f7a27ff92eaaa900d81d02486e6e2ea81d80b6f6cf1fe254350444980017e00cdeecdd3c67b86e7acc90cd2d77f06210bdd1d7b1a71d262df1
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Filesize
70KB
MD549aebf8cbd62d92ac215b2923fb1b9f5
SHA11723be06719828dda65ad804298d0431f6aff976
SHA256b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
SHA512bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b
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Filesize
181KB
MD54ea6026cf93ec6338144661bf1202cd1
SHA1a1dec9044f750ad887935a01430bf49322fbdcb7
SHA2568efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8
SHA5126c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b
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Filesize
28KB
MD5a2c9a66fa3b17974d30b095d43489e1f
SHA10467ebe5d5a590c339d78b37f5d13a299c0c4f3d
SHA256b927d476da8a330175e5c2a2aaeb1b36d3f81ec1c0a5b4a82e754a7f03211747
SHA512c35c8cfc5083e3c0dae54e1a5b3859512e6e1b7013309692ddb07b37a0b29aedb9a9ef209d1040f37213b705004c60ea9f93f62fe69a7cfc20d5abbc15478919
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Filesize
1KB
MD52ae13e407338f267d832d76416bdcf2b
SHA118111bb91b141960c4dde411c4067f000c0f9666
SHA256091bd9d13f82b1360ef519fd8f8af1b1e2a3774e5276ab3900494201cdaa3a95
SHA512cf2980e8b9236c104cf8da2349b357e2bbce3a81cf852a9bde1d1d9efc554bc6004a0943e4e7451890ef803120c31fe028cb913c2f7d95545ff024a993a7584c
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Filesize
1KB
MD59775076093a2f0cfc6a7d868fa243e25
SHA130e885a6862d672eac3d8edbd058b7e35297755a
SHA256085ea76158912e74da140e3300828e9d34c8d2f7c4d890d3266be46c86c0a5db
SHA51217a80c9040e8f31c6bac5f79e3416f2822a19612bd764959bbe1a9c963d6adaa1d8c315a269c1c12d49a96c90425449a57dcc76b138a0b524c32e5c782d6a68c
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Filesize
8KB
MD5b0fe74719b1b647e2056641931907f4a
SHA1e858c206d2d1542a79936cb00d85da853bfc95e2
SHA256bf316f51d0c345d61eaee3940791b64e81f676e3bca42bad61073227bee6653c
SHA5129c82e88264696d0dadef9c0442ad8d1183e48f0fb355a4fc9bf4fa5db4e27745039f98b1fd1febff620a5ded6dd493227f00d7d2e74b19757685aa8655f921c2