1730e8fd738a26adbe3f0b31192adf6d4cc175f021b2d06e6278e36a43efef40

Analysis

max time kernel
140s
max time network
150s
platform
windows10_x64
resource
win10v20201028
submitted
20-01-2021 16:13

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General

Target

iym.exe
Size

20KB
MD5

9d1c8d505aed4eb37bd5530a0b5b3b10
SHA1

8727180dafb631c287957dedbcc4f989fb0a5825
SHA256

1730e8fd738a26adbe3f0b31192adf6d4cc175f021b2d06e6278e36a43efef40
SHA512

0a1776064a7a82a53881036ed2b3ab9a30f0c842c826543202cbf6399cb10f6ca2544e95672e87ab59c84d5778544aa89dfaa802ab843aa57bf6bcbeb4f27bea

Score

10^/10

evasion persistence ransomware trojan

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

iym.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Local\\Temp\\iym.exe\""	iym.exe

Turns off Windows Defender SpyNet reporting 2 TTPs
evasion

Disabling Security Tools
T1089

Modify Registry
T1112
Windows security bypass 2 TTPs
evasion trojan

Disabling Security Tools
T1089

Modify Registry
T1112
Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

iym.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	iym.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	iym.exe

Drops startup file 2 IoCs

Processes:

iym.exe

description	ioc	process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\iym.exe	iym.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\iym.exe	iym.exe

Windows security modification 2 TTPs 11 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

iym.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Spynet\SpyNetReporting = "0"	iym.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Spynet\SubmitSamplesConsent = "0"	iym.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Exclusions\Paths	iym.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Exclusions	iym.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\iym.exe = "0"	iym.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Real-Time Protection	iym.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Real-Time Protection\DisableRealtimeMonitoring = "1"	iym.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Spynet	iym.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	iym.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\iym.exe = "0"	iym.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	iym.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

iym.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\<Unknown> = "C:\\Users\\Admin\\AppData\\Local\\Temp\\iym.exe"	iym.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\iym.exe = "C:\\Users\\Admin\\AppData\\Local\\Temp\\iym.exe"	iym.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

iym.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	iym.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum\0	iym.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
ransomware

System Information Discovery
T1082

Suspicious use of NtSetInformationThreadHideFromDebugger 15 IoCs

Processes:

iym.exe

pid	process
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe
4768	iym.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

iym.exe

description	pid	process	target process
PID 4768 set thread context of 3964	4768	iym.exe	iym.exe
PID 4768 set thread context of 4448	4768	iym.exe	iym.exe
PID 4768 set thread context of 4528	4768	iym.exe	iym.exe
PID 4768 set thread context of 4580	4768	iym.exe	iym.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

Processes:

powershell.exepowershell.exepowershell.exeiym.exepowershell.exeiym.exe

pid	process
704	powershell.exe
1128	powershell.exe
1316	powershell.exe
4768	iym.exe
1844	powershell.exe
3964	iym.exe
3964	iym.exe
704	powershell.exe
1128	powershell.exe
1316	powershell.exe
1844	powershell.exe
704	powershell.exe
1316	powershell.exe
1128	powershell.exe
1844	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

Processes:

iym.exepowershell.exepowershell.exepowershell.exepowershell.exeiym.exe

description	pid	process
Token: SeDebugPrivilege	4768	iym.exe
Token: SeDebugPrivilege	704	powershell.exe
Token: SeDebugPrivilege	1128	powershell.exe
Token: SeDebugPrivilege	1316	powershell.exe
Token: SeDebugPrivilege	1844	powershell.exe
Token: SeDebugPrivilege	3964	iym.exe

Suspicious use of WriteProcessMemory 44 IoCs

Processes:

iym.exe

description	pid	process	target process
PID 4768 wrote to memory of 704	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 704	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 704	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 1128	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 1128	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 1128	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 1316	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 1316	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 1316	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 1844	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 1844	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 1844	4768	iym.exe	powershell.exe
PID 4768 wrote to memory of 3964	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 3964	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 3964	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 3964	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 3964	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 3964	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 3964	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 3964	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4448	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4448	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4448	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4448	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4448	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4448	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4448	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4448	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4528	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4528	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4528	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4528	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4528	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4528	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4528	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4528	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4580	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4580	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4580	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4580	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4580	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4580	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4580	4768	iym.exe	iym.exe
PID 4768 wrote to memory of 4580	4768	iym.exe	iym.exe

C:\Users\Admin\AppData\Local\Temp\iym.exe
"C:\Users\Admin\AppData\Local\Temp\iym.exe"
1⤵
- Modifies WinLogon for persistence
- Checks BIOS information in registry
- Drops startup file
- Windows security modification
- Adds Run key to start application
- Maps connected drives based on registry
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4768

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\iym.exe" -Force
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:704

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\iym.exe" -Force
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1128

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\iym.exe" -Force
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1316

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\iym.exe" -Force
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1844

C:\Users\Admin\AppData\Local\Temp\iym.exe
"C:\Users\Admin\AppData\Local\Temp\iym.exe"
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3964

C:\Users\Admin\AppData\Local\Temp\iym.exe
"C:\Users\Admin\AppData\Local\Temp\iym.exe"
2⤵
PID:4448

C:\Users\Admin\AppData\Local\Temp\iym.exe
"C:\Users\Admin\AppData\Local\Temp\iym.exe"
2⤵
PID:4528

C:\Users\Admin\AppData\Local\Temp\iym.exe
"C:\Users\Admin\AppData\Local\Temp\iym.exe"
2⤵
PID:4580

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Web Service

T1102

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
MD5
db01a2c1c7e70b2b038edf8ad5ad9826

SHA1
540217c647a73bad8d8a79e3a0f3998b5abd199b

SHA256
413da361d77055dae7007f82b58b366c8783aa72e0b8fbe41519b940c253b38d

SHA512
c76ff57fcee5cdf9fdf3116d4e1dc0cf106867bf19ab474b763e242acf5dca9a7509cb837c35e130c3e056636b4e8a4e135512a978bcd3dd641e20f5bf76c3d6

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
MD5
6256bab40e901b897018ffa79e810f22

SHA1
200a92db7c07fcb8ead26ad8811ccd1eb8aff764

SHA256
c06434b99fd8bb9e5eea39dbdf9fc7b50c7769889b83081e8b631504e466e5e6

SHA512
acde7b895b122986621d1feadb840960cd27f68fb7af6484caab563457467361e171b9887aed726d18480fba0cc63792e3b73a745e40450d1fdded4efb14e888

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
MD5
a728ab68af196d4a4c46b9bc78e539a8

SHA1
70c763e370e2e9735e50ed4b7c7cc4c342ee0abe

SHA256
576cff6271b29d4fc711bb3ccbb65a213440408cfbdda67b610555d30f5de7aa

SHA512
cb5d5336e77d061327e875807e043485f42ec9ab24837a14a9d8774605f7bc29946f17340be17cde229f9956c8e5fcfceaa9a7484cc7879be0b9336864404387

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
MD5
a728ab68af196d4a4c46b9bc78e539a8

SHA1
70c763e370e2e9735e50ed4b7c7cc4c342ee0abe

SHA256
576cff6271b29d4fc711bb3ccbb65a213440408cfbdda67b610555d30f5de7aa

SHA512
cb5d5336e77d061327e875807e043485f42ec9ab24837a14a9d8774605f7bc29946f17340be17cde229f9956c8e5fcfceaa9a7484cc7879be0b9336864404387

Download Submit
memory/704-119-0x000000007F0B0000-0x000000007F0B1000-memory.dmp

Filesize
4KB

Download
memory/704-86-0x0000000008F40000-0x0000000008F73000-memory.dmp

Filesize
204KB

Download
memory/704-134-0x0000000006BF3000-0x0000000006BF4000-memory.dmp

Filesize
4KB

Download
memory/704-52-0x0000000006BF2000-0x0000000006BF3000-memory.dmp

Filesize
4KB

Download
memory/704-126-0x00000000094A0000-0x00000000094A1000-memory.dmp

Filesize
4KB

Download
memory/704-12-0x0000000000000000-mapping.dmp

Download
memory/704-144-0x0000000009400000-0x0000000009401000-memory.dmp

Filesize
4KB

Download
memory/704-43-0x0000000006BF0000-0x0000000006BF1000-memory.dmp

Filesize
4KB

Download
memory/704-70-0x0000000007210000-0x0000000007211000-memory.dmp

Filesize
4KB

Download
memory/704-73-0x00000000083B0000-0x00000000083B1000-memory.dmp

Filesize
4KB

Download
memory/704-16-0x0000000073150000-0x000000007383E000-memory.dmp

Filesize
6.9MB

Download
memory/704-33-0x0000000007AD0000-0x0000000007AD1000-memory.dmp

Filesize
4KB

Download
memory/704-19-0x0000000001240000-0x0000000001241000-memory.dmp

Filesize
4KB

Download
memory/704-21-0x0000000007230000-0x0000000007231000-memory.dmp

Filesize
4KB

Download
memory/704-78-0x0000000008230000-0x0000000008231000-memory.dmp

Filesize
4KB

Download
memory/704-28-0x0000000006FE0000-0x0000000006FE1000-memory.dmp

Filesize
4KB

Download
memory/704-29-0x0000000007180000-0x0000000007181000-memory.dmp

Filesize
4KB

Download
memory/1128-13-0x0000000000000000-mapping.dmp

Download
memory/1128-18-0x0000000073150000-0x000000007383E000-memory.dmp

Filesize
6.9MB

Download
memory/1128-61-0x0000000006DF2000-0x0000000006DF3000-memory.dmp

Filesize
4KB

Download
memory/1128-123-0x000000007F310000-0x000000007F311000-memory.dmp

Filesize
4KB

Download
memory/1128-47-0x0000000006DF0000-0x0000000006DF1000-memory.dmp

Filesize
4KB

Download
memory/1128-135-0x0000000006DF3000-0x0000000006DF4000-memory.dmp

Filesize
4KB

Download
memory/1316-63-0x0000000004C62000-0x0000000004C63000-memory.dmp

Filesize
4KB

Download
memory/1316-132-0x0000000004C63000-0x0000000004C64000-memory.dmp

Filesize
4KB

Download
memory/1316-14-0x0000000000000000-mapping.dmp

Download
memory/1316-120-0x0000000009620000-0x0000000009621000-memory.dmp

Filesize
4KB

Download
memory/1316-115-0x000000007E0E0000-0x000000007E0E1000-memory.dmp

Filesize
4KB

Download
memory/1316-114-0x00000000087D0000-0x00000000087D1000-memory.dmp

Filesize
4KB

Download
memory/1316-55-0x0000000004C60000-0x0000000004C61000-memory.dmp

Filesize
4KB

Download
memory/1316-17-0x0000000073150000-0x000000007383E000-memory.dmp

Filesize
6.9MB

Download
memory/1316-87-0x00000000094F0000-0x0000000009523000-memory.dmp

Filesize
204KB

Download
memory/1844-64-0x00000000073D0000-0x00000000073D1000-memory.dmp

Filesize
4KB

Download
memory/1844-66-0x00000000073D2000-0x00000000073D3000-memory.dmp

Filesize
4KB

Download
memory/1844-136-0x0000000009A20000-0x0000000009A21000-memory.dmp

Filesize
4KB

Download
memory/1844-133-0x00000000073D3000-0x00000000073D4000-memory.dmp

Filesize
4KB

Download
memory/1844-125-0x000000007EF50000-0x000000007EF51000-memory.dmp

Filesize
4KB

Download
memory/1844-24-0x0000000073150000-0x000000007383E000-memory.dmp

Filesize
6.9MB

Download
memory/1844-15-0x0000000000000000-mapping.dmp

Download
memory/3964-60-0x0000000005520000-0x0000000005521000-memory.dmp

Filesize
4KB

Download
memory/3964-130-0x0000000005820000-0x0000000005821000-memory.dmp

Filesize
4KB

Download
memory/3964-34-0x0000000073150000-0x000000007383E000-memory.dmp

Filesize
6.9MB

Download
memory/3964-32-0x00000000004374DE-mapping.dmp

Download
memory/3964-31-0x0000000000400000-0x000000000043C000-memory.dmp

Filesize
240KB

Download
memory/4448-40-0x0000000073150000-0x000000007383E000-memory.dmp

Filesize
6.9MB

Download
memory/4448-37-0x00000000004374DE-mapping.dmp

Download
memory/4528-54-0x0000000073150000-0x000000007383E000-memory.dmp

Filesize
6.9MB

Download
memory/4528-48-0x00000000004374DE-mapping.dmp

Download
memory/4768-11-0x00000000069E0000-0x00000000069E1000-memory.dmp

Filesize
4KB

Download
memory/4768-2-0x0000000073150000-0x000000007383E000-memory.dmp

Filesize
6.9MB

Download
memory/4768-10-0x0000000001400000-0x0000000001464000-memory.dmp

Filesize
400KB

Download
memory/4768-9-0x0000000005550000-0x0000000005551000-memory.dmp

Filesize
4KB

Download
memory/4768-68-0x0000000005FD0000-0x0000000005FD1000-memory.dmp

Filesize
4KB

Download
memory/4768-8-0x0000000005680000-0x0000000005681000-memory.dmp

Filesize
4KB

Download
memory/4768-7-0x00000000056B0000-0x00000000056B1000-memory.dmp

Filesize
4KB

Download
memory/4768-6-0x0000000005570000-0x0000000005571000-memory.dmp

Filesize
4KB

Download
memory/4768-5-0x0000000005980000-0x0000000005981000-memory.dmp

Filesize
4KB

Download
memory/4768-3-0x0000000000D50000-0x0000000000D51000-memory.dmp

Filesize
4KB

Download