Analysis
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max time kernel
36s -
max time network
137s -
platform
windows7_x64 -
resource
win7v20201028 -
submitted
22-01-2021 17:06
Static task
static1
Behavioral task
behavioral1
Sample
IMG_5371.EXE
Resource
win7v20201028
Behavioral task
behavioral2
Sample
IMG_5371.EXE
Resource
win10v20201028
General
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Target
IMG_5371.EXE
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Size
1.4MB
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MD5
dab644bd40ca9f103fcbdd74ebe39a2d
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SHA1
f3c2aacc1c81f58e9975f4e89fab04ebd1d87377
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SHA256
67f3cc2b3a57590f2e4bb1e496a0b2d0da8cece64efc73da021c9c0bde2c6f9c
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SHA512
2fd1b216531e27ab66ea47f51a9d58fcb5a342937109d07df881c346384e369835655bd6e2fcbe284a8fc72757542e446f495271c9df9c0533a22640f3d55ac0
Malware Config
Signatures
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Snake Keylogger
Keylogger and Infostealer first seen in November 2020.
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Snake Keylogger Payload 3 IoCs
Processes:
resource yara_rule behavioral1/memory/688-26-0x0000000000400000-0x0000000000468000-memory.dmp family_snakekeylogger behavioral1/memory/688-27-0x000000000046381E-mapping.dmp family_snakekeylogger behavioral1/memory/688-30-0x0000000000400000-0x0000000000468000-memory.dmp family_snakekeylogger -
Executes dropped EXE 2 IoCs
Processes:
nsou.exeInstallUtil.exepid process 696 nsou.exe 688 InstallUtil.exe -
Loads dropped DLL 2 IoCs
Processes:
IMG_5371.EXEnsou.exepid process 544 IMG_5371.EXE 696 nsou.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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Adds Run key to start application 2 TTPs 2 IoCs
Processes:
reg.exedescription ioc process Key created \REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run reg.exe Set value (str) \REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\naets = "C:\\Users\\Admin\\AppData\\Roaming\\nsou.exe" reg.exe -
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 5 checkip.dyndns.org 10 freegeoip.app 11 freegeoip.app -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Suspicious use of SetThreadContext 1 IoCs
Processes:
nsou.exedescription pid process target process PID 696 set thread context of 688 696 nsou.exe InstallUtil.exe -
Suspicious behavior: EnumeratesProcesses 14 IoCs
Processes:
IMG_5371.EXEnsou.exeInstallUtil.exepid process 544 IMG_5371.EXE 544 IMG_5371.EXE 544 IMG_5371.EXE 544 IMG_5371.EXE 544 IMG_5371.EXE 696 nsou.exe 696 nsou.exe 688 InstallUtil.exe 688 InstallUtil.exe 688 InstallUtil.exe 688 InstallUtil.exe 688 InstallUtil.exe 688 InstallUtil.exe 688 InstallUtil.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
Processes:
IMG_5371.EXEnsou.exeInstallUtil.exedescription pid process Token: SeDebugPrivilege 544 IMG_5371.EXE Token: SeDebugPrivilege 696 nsou.exe Token: SeDebugPrivilege 688 InstallUtil.exe -
Suspicious use of WriteProcessMemory 24 IoCs
Processes:
IMG_5371.EXEcmd.exensou.exedescription pid process target process PID 544 wrote to memory of 1280 544 IMG_5371.EXE cmd.exe PID 544 wrote to memory of 1280 544 IMG_5371.EXE cmd.exe PID 544 wrote to memory of 1280 544 IMG_5371.EXE cmd.exe PID 544 wrote to memory of 1280 544 IMG_5371.EXE cmd.exe PID 1280 wrote to memory of 916 1280 cmd.exe reg.exe PID 1280 wrote to memory of 916 1280 cmd.exe reg.exe PID 1280 wrote to memory of 916 1280 cmd.exe reg.exe PID 1280 wrote to memory of 916 1280 cmd.exe reg.exe PID 544 wrote to memory of 696 544 IMG_5371.EXE nsou.exe PID 544 wrote to memory of 696 544 IMG_5371.EXE nsou.exe PID 544 wrote to memory of 696 544 IMG_5371.EXE nsou.exe PID 544 wrote to memory of 696 544 IMG_5371.EXE nsou.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe PID 696 wrote to memory of 688 696 nsou.exe InstallUtil.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\IMG_5371.EXE"C:\Users\Admin\AppData\Local\Temp\IMG_5371.EXE"1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"cmd.exe" /c REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /f /v "naets" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\nsou.exe"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\reg.exeREG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /f /v "naets" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\nsou.exe"3⤵
- Adds Run key to start application
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C:\Users\Admin\AppData\Roaming\nsou.exe"C:\Users\Admin\AppData\Roaming\nsou.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\AppData\Roaming\nsou.exeMD5
dab644bd40ca9f103fcbdd74ebe39a2d
SHA1f3c2aacc1c81f58e9975f4e89fab04ebd1d87377
SHA25667f3cc2b3a57590f2e4bb1e496a0b2d0da8cece64efc73da021c9c0bde2c6f9c
SHA5122fd1b216531e27ab66ea47f51a9d58fcb5a342937109d07df881c346384e369835655bd6e2fcbe284a8fc72757542e446f495271c9df9c0533a22640f3d55ac0
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C:\Users\Admin\AppData\Roaming\nsou.exeMD5
dab644bd40ca9f103fcbdd74ebe39a2d
SHA1f3c2aacc1c81f58e9975f4e89fab04ebd1d87377
SHA25667f3cc2b3a57590f2e4bb1e496a0b2d0da8cece64efc73da021c9c0bde2c6f9c
SHA5122fd1b216531e27ab66ea47f51a9d58fcb5a342937109d07df881c346384e369835655bd6e2fcbe284a8fc72757542e446f495271c9df9c0533a22640f3d55ac0
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\Users\Admin\AppData\Local\Temp\InstallUtil.exeMD5
91c9ae9c9a17a9db5e08b120e668c74c
SHA150770954c1ceb0bb6f1d5d3f2de2a0a065773723
SHA256e56a7e5d3ab9675555e2897fc3faa2dd9265008a4967a7d54030ab8184d2d38f
SHA512ca504af192e3318359d4742a2ef26ae1b5d040a4f9942782e02549a310158d5d5dbf919b4c748c31ee609d2046bd23ee0c22712891c86ae4a1e3a58c6e67647e
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\Users\Admin\AppData\Roaming\nsou.exeMD5
dab644bd40ca9f103fcbdd74ebe39a2d
SHA1f3c2aacc1c81f58e9975f4e89fab04ebd1d87377
SHA25667f3cc2b3a57590f2e4bb1e496a0b2d0da8cece64efc73da021c9c0bde2c6f9c
SHA5122fd1b216531e27ab66ea47f51a9d58fcb5a342937109d07df881c346384e369835655bd6e2fcbe284a8fc72757542e446f495271c9df9c0533a22640f3d55ac0
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memory/544-7-0x0000000001F80000-0x0000000001F81000-memory.dmpFilesize
4KB
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memory/544-10-0x0000000001F81000-0x0000000001F82000-memory.dmpFilesize
4KB
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memory/544-6-0x00000000006F0000-0x00000000006F1000-memory.dmpFilesize
4KB
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memory/544-2-0x00000000749D0000-0x00000000750BE000-memory.dmpFilesize
6.9MB
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memory/544-5-0x00000000005E0000-0x00000000005FE000-memory.dmpFilesize
120KB
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memory/544-3-0x0000000000360000-0x0000000000361000-memory.dmpFilesize
4KB
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memory/688-30-0x0000000000400000-0x0000000000468000-memory.dmpFilesize
416KB
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memory/688-29-0x00000000749D0000-0x00000000750BE000-memory.dmpFilesize
6.9MB
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memory/688-32-0x0000000004B80000-0x0000000004B81000-memory.dmpFilesize
4KB
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memory/688-27-0x000000000046381E-mapping.dmp
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memory/688-26-0x0000000000400000-0x0000000000468000-memory.dmpFilesize
416KB
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memory/696-15-0x00000000749D0000-0x00000000750BE000-memory.dmpFilesize
6.9MB
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memory/696-22-0x0000000000B50000-0x0000000000B51000-memory.dmpFilesize
4KB
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memory/696-25-0x0000000000A11000-0x0000000000A12000-memory.dmpFilesize
4KB
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memory/696-21-0x00000000010A0000-0x00000000010AB000-memory.dmpFilesize
44KB
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memory/696-20-0x0000000000A10000-0x0000000000A11000-memory.dmpFilesize
4KB
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memory/696-16-0x0000000001190000-0x0000000001191000-memory.dmpFilesize
4KB
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memory/696-12-0x0000000000000000-mapping.dmp
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memory/916-9-0x0000000000000000-mapping.dmp
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memory/1280-8-0x0000000000000000-mapping.dmp