Analysis
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max time kernel
44s -
max time network
146s -
platform
windows7_x64 -
resource
win7v20201028 -
submitted
20-01-2021 06:32
Static task
static1
Behavioral task
behavioral1
Sample
IMG_25579.pdf.exe
Resource
win7v20201028
Behavioral task
behavioral2
Sample
IMG_25579.pdf.exe
Resource
win10v20201028
General
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Target
IMG_25579.pdf.exe
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Size
1.4MB
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MD5
5ab98f94682ec463f48cada8b9811055
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SHA1
550fc889de33b94a63dfaf1138bcc54be489f767
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SHA256
b1c89b167239238aea8a718d40751a1233ab4b9479b19e6feb86ed5a4c9aec20
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SHA512
e3e4ed794ebf4bf3e246eab58699df4b822fdea5cab238b1a838c09b2d596a5228db934e631a843010df618e42524a32e7d4b750d536c9f20c827b78d71b87c6
Malware Config
Signatures
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Snake Keylogger
Keylogger and Infostealer first seen in November 2020.
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Snake Keylogger Payload 2 IoCs
Processes:
resource yara_rule behavioral1/memory/856-25-0x000000000046370E-mapping.dmp family_snakekeylogger behavioral1/memory/856-27-0x0000000000090000-0x00000000000F8000-memory.dmp family_snakekeylogger -
Executes dropped EXE 2 IoCs
Processes:
bsys.exeInstallUtil.exepid process 1516 bsys.exe 856 InstallUtil.exe -
Drops startup file 1 IoCs
Processes:
IMG_25579.pdf.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bsys.lnk IMG_25579.pdf.exe -
Loads dropped DLL 2 IoCs
Processes:
IMG_25579.pdf.exebsys.exepid process 1096 IMG_25579.pdf.exe 1516 bsys.exe -
Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
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Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
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Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
Processes:
flow ioc 10 freegeoip.app 11 freegeoip.app 5 checkip.dyndns.org -
Suspicious use of SetThreadContext 1 IoCs
Processes:
bsys.exedescription pid process target process PID 1516 set thread context of 856 1516 bsys.exe InstallUtil.exe -
Suspicious behavior: EnumeratesProcesses 14 IoCs
Processes:
IMG_25579.pdf.exebsys.exeInstallUtil.exepid process 1096 IMG_25579.pdf.exe 1096 IMG_25579.pdf.exe 1096 IMG_25579.pdf.exe 1096 IMG_25579.pdf.exe 1096 IMG_25579.pdf.exe 1516 bsys.exe 1516 bsys.exe 856 InstallUtil.exe 856 InstallUtil.exe 856 InstallUtil.exe 856 InstallUtil.exe 856 InstallUtil.exe 856 InstallUtil.exe 856 InstallUtil.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
Processes:
IMG_25579.pdf.exebsys.exeInstallUtil.exedescription pid process Token: SeDebugPrivilege 1096 IMG_25579.pdf.exe Token: SeDebugPrivilege 1516 bsys.exe Token: SeDebugPrivilege 856 InstallUtil.exe -
Suspicious use of WriteProcessMemory 16 IoCs
Processes:
IMG_25579.pdf.exebsys.exedescription pid process target process PID 1096 wrote to memory of 1516 1096 IMG_25579.pdf.exe bsys.exe PID 1096 wrote to memory of 1516 1096 IMG_25579.pdf.exe bsys.exe PID 1096 wrote to memory of 1516 1096 IMG_25579.pdf.exe bsys.exe PID 1096 wrote to memory of 1516 1096 IMG_25579.pdf.exe bsys.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe PID 1516 wrote to memory of 856 1516 bsys.exe InstallUtil.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\IMG_25579.pdf.exe"C:\Users\Admin\AppData\Local\Temp\IMG_25579.pdf.exe"1⤵
- Drops startup file
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\bsys.exe"C:\Users\Admin\bsys.exe"2⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe"C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe"3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\InstallUtil.exeMD5
91c9ae9c9a17a9db5e08b120e668c74c
SHA150770954c1ceb0bb6f1d5d3f2de2a0a065773723
SHA256e56a7e5d3ab9675555e2897fc3faa2dd9265008a4967a7d54030ab8184d2d38f
SHA512ca504af192e3318359d4742a2ef26ae1b5d040a4f9942782e02549a310158d5d5dbf919b4c748c31ee609d2046bd23ee0c22712891c86ae4a1e3a58c6e67647e
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C:\Users\Admin\AppData\Local\Temp\InstallUtil.exeMD5
91c9ae9c9a17a9db5e08b120e668c74c
SHA150770954c1ceb0bb6f1d5d3f2de2a0a065773723
SHA256e56a7e5d3ab9675555e2897fc3faa2dd9265008a4967a7d54030ab8184d2d38f
SHA512ca504af192e3318359d4742a2ef26ae1b5d040a4f9942782e02549a310158d5d5dbf919b4c748c31ee609d2046bd23ee0c22712891c86ae4a1e3a58c6e67647e
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C:\Users\Admin\bsys.exeMD5
5ab98f94682ec463f48cada8b9811055
SHA1550fc889de33b94a63dfaf1138bcc54be489f767
SHA256b1c89b167239238aea8a718d40751a1233ab4b9479b19e6feb86ed5a4c9aec20
SHA512e3e4ed794ebf4bf3e246eab58699df4b822fdea5cab238b1a838c09b2d596a5228db934e631a843010df618e42524a32e7d4b750d536c9f20c827b78d71b87c6
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C:\Users\Admin\bsys.exeMD5
5ab98f94682ec463f48cada8b9811055
SHA1550fc889de33b94a63dfaf1138bcc54be489f767
SHA256b1c89b167239238aea8a718d40751a1233ab4b9479b19e6feb86ed5a4c9aec20
SHA512e3e4ed794ebf4bf3e246eab58699df4b822fdea5cab238b1a838c09b2d596a5228db934e631a843010df618e42524a32e7d4b750d536c9f20c827b78d71b87c6
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\Users\Admin\AppData\Local\Temp\InstallUtil.exeMD5
91c9ae9c9a17a9db5e08b120e668c74c
SHA150770954c1ceb0bb6f1d5d3f2de2a0a065773723
SHA256e56a7e5d3ab9675555e2897fc3faa2dd9265008a4967a7d54030ab8184d2d38f
SHA512ca504af192e3318359d4742a2ef26ae1b5d040a4f9942782e02549a310158d5d5dbf919b4c748c31ee609d2046bd23ee0c22712891c86ae4a1e3a58c6e67647e
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\Users\Admin\bsys.exeMD5
5ab98f94682ec463f48cada8b9811055
SHA1550fc889de33b94a63dfaf1138bcc54be489f767
SHA256b1c89b167239238aea8a718d40751a1233ab4b9479b19e6feb86ed5a4c9aec20
SHA512e3e4ed794ebf4bf3e246eab58699df4b822fdea5cab238b1a838c09b2d596a5228db934e631a843010df618e42524a32e7d4b750d536c9f20c827b78d71b87c6
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memory/856-31-0x0000000000690000-0x0000000000691000-memory.dmpFilesize
4KB
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memory/856-29-0x0000000000090000-0x0000000000092000-memory.dmpFilesize
8KB
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memory/856-28-0x0000000074500000-0x0000000074BEE000-memory.dmpFilesize
6.9MB
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memory/856-27-0x0000000000090000-0x00000000000F8000-memory.dmpFilesize
416KB
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memory/856-25-0x000000000046370E-mapping.dmp
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memory/1096-3-0x0000000000970000-0x0000000000971000-memory.dmpFilesize
4KB
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memory/1096-8-0x0000000004A91000-0x0000000004A92000-memory.dmpFilesize
4KB
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memory/1096-7-0x0000000004A90000-0x0000000004A91000-memory.dmpFilesize
4KB
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memory/1096-2-0x0000000074580000-0x0000000074C6E000-memory.dmpFilesize
6.9MB
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memory/1096-6-0x0000000000560000-0x0000000000561000-memory.dmpFilesize
4KB
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memory/1096-5-0x0000000000540000-0x000000000055E000-memory.dmpFilesize
120KB
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memory/1516-13-0x0000000074580000-0x0000000074C6E000-memory.dmpFilesize
6.9MB
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memory/1516-23-0x0000000004D31000-0x0000000004D32000-memory.dmpFilesize
4KB
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memory/1516-20-0x00000000006C0000-0x00000000006C1000-memory.dmpFilesize
4KB
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memory/1516-19-0x0000000000670000-0x000000000067B000-memory.dmpFilesize
44KB
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memory/1516-18-0x0000000004D30000-0x0000000004D31000-memory.dmpFilesize
4KB
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memory/1516-14-0x0000000000CF0000-0x0000000000CF1000-memory.dmpFilesize
4KB
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memory/1516-10-0x0000000000000000-mapping.dmp