Analysis
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max time kernel
90s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20220901-en -
resource tags
arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system -
submitted
29/12/2022, 09:32
Static task
static1
Behavioral task
behavioral1
Sample
file.exe
Resource
win7-20221111-en
General
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Target
file.exe
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Size
1.8MB
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MD5
8c7930b4303b76bbe17d269203ccd90f
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SHA1
21716d6eb99fa038c2d177fb50ed4f00db41b141
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SHA256
ae5d734426e67cabba63394ce9b7a0d3b328ce8df3e80d3e001f72b8bd1d48b6
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SHA512
e58b1aa685cc1ba02a13b358039a56ec68ba274d84091389d822f7cc91ba887223b5ecdb52689eb090caa0a6d8d22acba6a39d8f015d39e3e9dc44c340ae1f20
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SSDEEP
49152:AitJktjfhujtQVEgbYRZ4kgEvh3UxxbarT+LNB:AiUpAtQbtkNUxGSv
Malware Config
Extracted
nymaim
45.139.105.171
85.31.46.167
Signatures
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Executes dropped EXE 3 IoCs
pid Process 544 is-KSM4S.tmp 4928 SplitFiles124.exe 632 0BSGDoUZTy1.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation SplitFiles124.exe -
Loads dropped DLL 1 IoCs
pid Process 544 is-KSM4S.tmp -
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Drops file in Program Files directory 17 IoCs
description ioc Process File opened for modification C:\Program Files (x86)\Split Files\unins000.dat is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\unins000.dat is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\is-FUCUB.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\is-H6RBS.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\language\is-3FURB.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\language\is-J9R8N.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\language\is-H8Q8S.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\language\is-MAEO3.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\language\is-DKORU.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\language\is-LJ166.tmp is-KSM4S.tmp File opened for modification C:\Program Files (x86)\Split Files\SplitFiles124.exe is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\language\is-TT7VT.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\language\is-J152E.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\language\is-URH92.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\is-TS3JJ.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\is-MTKTB.tmp is-KSM4S.tmp File created C:\Program Files (x86)\Split Files\is-QKTF3.tmp is-KSM4S.tmp -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Kills process with taskkill 1 IoCs
pid Process 5108 taskkill.exe -
Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 4928 SplitFiles124.exe 4928 SplitFiles124.exe 4928 SplitFiles124.exe 4928 SplitFiles124.exe 4928 SplitFiles124.exe 4928 SplitFiles124.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 5108 taskkill.exe -
Suspicious use of WriteProcessMemory 15 IoCs
description pid Process procid_target PID 5072 wrote to memory of 544 5072 file.exe 82 PID 5072 wrote to memory of 544 5072 file.exe 82 PID 5072 wrote to memory of 544 5072 file.exe 82 PID 544 wrote to memory of 4928 544 is-KSM4S.tmp 83 PID 544 wrote to memory of 4928 544 is-KSM4S.tmp 83 PID 544 wrote to memory of 4928 544 is-KSM4S.tmp 83 PID 4928 wrote to memory of 632 4928 SplitFiles124.exe 84 PID 4928 wrote to memory of 632 4928 SplitFiles124.exe 84 PID 4928 wrote to memory of 632 4928 SplitFiles124.exe 84 PID 4928 wrote to memory of 2844 4928 SplitFiles124.exe 92 PID 4928 wrote to memory of 2844 4928 SplitFiles124.exe 92 PID 4928 wrote to memory of 2844 4928 SplitFiles124.exe 92 PID 2844 wrote to memory of 5108 2844 cmd.exe 94 PID 2844 wrote to memory of 5108 2844 cmd.exe 94 PID 2844 wrote to memory of 5108 2844 cmd.exe 94
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Suspicious use of WriteProcessMemory
PID:5072 -
C:\Users\Admin\AppData\Local\Temp\is-R3PAG.tmp\is-KSM4S.tmp"C:\Users\Admin\AppData\Local\Temp\is-R3PAG.tmp\is-KSM4S.tmp" /SL4 $70034 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1594893 967682⤵
- Executes dropped EXE
- Loads dropped DLL
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:544 -
C:\Program Files (x86)\Split Files\SplitFiles124.exe"C:\Program Files (x86)\Split Files\SplitFiles124.exe"3⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4928 -
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\0BSGDoUZTy1.exe4⤵
- Executes dropped EXE
PID:632
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles124.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles124.exe" & exit4⤵
- Suspicious use of WriteProcessMemory
PID:2844 -
C:\Windows\SysWOW64\taskkill.exetaskkill /im "SplitFiles124.exe" /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:5108
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
3.1MB
MD5cf7a577507ed423d2e163ce8a2840798
SHA152d206716b01097768041990f483b4562d0415c4
SHA256742273e57f00f26bbaade2689d643824e1b72c400682eafa4613993e586c0786
SHA512fb09b84e9b818f5e1dd4623e1b05d453643ad2d0c9afb15a05e516dde76717141a553c5f9032abaebbcae3a98644af8b043712d7ea440d389bfe30af257c0296
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Filesize
3.1MB
MD5cf7a577507ed423d2e163ce8a2840798
SHA152d206716b01097768041990f483b4562d0415c4
SHA256742273e57f00f26bbaade2689d643824e1b72c400682eafa4613993e586c0786
SHA512fb09b84e9b818f5e1dd4623e1b05d453643ad2d0c9afb15a05e516dde76717141a553c5f9032abaebbcae3a98644af8b043712d7ea440d389bfe30af257c0296
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Filesize
2KB
MD5a69559718ab506675e907fe49deb71e9
SHA1bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA2562f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
SHA512e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
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Filesize
688KB
MD5807603f3a565337ee2ac3e819b25ee58
SHA15cc4e6c82fbdda6697a1117561f23731d51baacd
SHA256682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423
SHA512252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d
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Filesize
688KB
MD5807603f3a565337ee2ac3e819b25ee58
SHA15cc4e6c82fbdda6697a1117561f23731d51baacd
SHA256682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423
SHA512252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d
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Filesize
72KB
MD53fb36cb0b7172e5298d2992d42984d06
SHA1439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA25627ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
SHA5126b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
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Filesize
72KB
MD53fb36cb0b7172e5298d2992d42984d06
SHA1439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA25627ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
SHA5126b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c