16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de

General

Target

16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
Size

262KB
MD5

7a4a132477b6404266d3ee2e39699ec0
SHA1

c7fe57d8670934336a813acc1d743e6a58d08893
SHA256

16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de
SHA512

579854d3bbdae6e1ef35f07d6c3756d3ca0b45f1b9c1fa0e8a2d62e2e7adf3b7a55a7fda00bf26c582d5c8547940bfe32d763e3efbb5eae792cf595964c1e74e
SSDEEP

6144:59uUhxhJ1VpcVmcOClV7cN1kyymJuc4El3M:59nJ7iIAZV

Score

10^/10

evasion persistence

Malware Config

Signatures

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1158

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	yaisi.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe

Executes dropped EXE 1 IoCs

pid	Process
2012	yaisi.exe

Loads dropped DLL 2 IoCs

pid	Process
912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe

Adds Run key to start application 2 TTPs 12 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\yaisi = "C:\\Users\\Admin\\yaisi.exe /l"	yaisi.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\yaisi = "C:\\Users\\Admin\\yaisi.exe /o"	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\yaisi = "C:\\Users\\Admin\\yaisi.exe /v"	yaisi.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\yaisi = "C:\\Users\\Admin\\yaisi.exe /s"	yaisi.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\yaisi = "C:\\Users\\Admin\\yaisi.exe /e"	yaisi.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\yaisi = "C:\\Users\\Admin\\yaisi.exe /m"	yaisi.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\	yaisi.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\yaisi = "C:\\Users\\Admin\\yaisi.exe /p"	yaisi.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\yaisi = "C:\\Users\\Admin\\yaisi.exe /c"	yaisi.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\yaisi = "C:\\Users\\Admin\\yaisi.exe /i"	yaisi.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\yaisi = "C:\\Users\\Admin\\yaisi.exe /n"	yaisi.exe

Maps connected drives based on registry 3 TTPs 4 IoCs

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

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	yaisi.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	yaisi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe

Drops autorun.inf file 1 TTPs 1 IoCs

Malware can abuse Windows Autorun to spread further via attached volumes.

Replication Through Removable Media

T1091

description	ioc	Process
File opened for modification	C:\Users\Admin\c\autorun.inf	yaisi.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 48 IoCs

pid	Process
912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe
2012	yaisi.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
2012	yaisi.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 912 wrote to memory of 2012	912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe	28
PID 912 wrote to memory of 2012	912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe	28
PID 912 wrote to memory of 2012	912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe	28
PID 912 wrote to memory of 2012	912	16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe	28

C:\Users\Admin\AppData\Local\Temp\16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe
"C:\Users\Admin\AppData\Local\Temp\16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de.exe"
1⤵
- Modifies visiblity of hidden/system files in Explorer
- Loads dropped DLL
- Adds Run key to start application
- Maps connected drives based on registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:912
- C:\Users\Admin\yaisi.exe
  "C:\Users\Admin\yaisi.exe"
  2⤵
  - Modifies visiblity of hidden/system files in Explorer
  - Executes dropped EXE
  - Adds Run key to start application
  - Maps connected drives based on registry
  - Drops autorun.inf file
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  PID:2012

Network

MITRE ATT&CK Enterprise v6

Initial Access

Replication Through Removable Media

1

T1091

Execution

Persistence

Hidden Files and Directories

1

T1158

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

Lateral Movement

Replication Through Removable Media

1

T1091

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\yaisi.exe

Filesize
262KB

MD5
7a4a132477b6404266d3ee2e39699ec0

SHA1
c7fe57d8670934336a813acc1d743e6a58d08893

SHA256
16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de

SHA512
579854d3bbdae6e1ef35f07d6c3756d3ca0b45f1b9c1fa0e8a2d62e2e7adf3b7a55a7fda00bf26c582d5c8547940bfe32d763e3efbb5eae792cf595964c1e74e

Download Submit
C:\Users\Admin\yaisi.exe

Filesize
262KB

MD5
7a4a132477b6404266d3ee2e39699ec0

SHA1
c7fe57d8670934336a813acc1d743e6a58d08893

SHA256
16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de

SHA512
579854d3bbdae6e1ef35f07d6c3756d3ca0b45f1b9c1fa0e8a2d62e2e7adf3b7a55a7fda00bf26c582d5c8547940bfe32d763e3efbb5eae792cf595964c1e74e

Download Submit
\Users\Admin\yaisi.exe

Filesize
262KB

MD5
7a4a132477b6404266d3ee2e39699ec0

SHA1
c7fe57d8670934336a813acc1d743e6a58d08893

SHA256
16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de

SHA512
579854d3bbdae6e1ef35f07d6c3756d3ca0b45f1b9c1fa0e8a2d62e2e7adf3b7a55a7fda00bf26c582d5c8547940bfe32d763e3efbb5eae792cf595964c1e74e

Download Submit
\Users\Admin\yaisi.exe

Filesize
262KB

MD5
7a4a132477b6404266d3ee2e39699ec0

SHA1
c7fe57d8670934336a813acc1d743e6a58d08893

SHA256
16ae36fe832187699dba155c62277678b578b209428745f28a8323555511a5de

SHA512
579854d3bbdae6e1ef35f07d6c3756d3ca0b45f1b9c1fa0e8a2d62e2e7adf3b7a55a7fda00bf26c582d5c8547940bfe32d763e3efbb5eae792cf595964c1e74e

Download Submit
memory/912-56-0x0000000076091000-0x0000000076093000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads