ratty | 892259f6f9ac19e8375b35e6838c0c4f17052041306f199eb59b6857fe07bedf

General

Target

2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.jar
Size

761KB
MD5

22e4d501be6ca69e29bc2a21782bd9e1
SHA1

93bd6f32a6afec897679ec96feb72627ea79d6ef
SHA256

1b7560d64e9fc2a468cc3e251669dd05df851f6432b8f3c373f06bd6aaf82d31
SHA512

f4b836bc1aaaece82e2ef590bb214227c23578d57f8e4caf6778f269b85b4337dda99a8f43cb5d286b44528c8d7ac25e6d42a899a98dcdc6047aeb59fdea3c83
SSDEEP

12288:XClCM+jp72GYshJCa65jUXBosjWhMMJWX7AfoJLTpbyjkGZnCgAJt5JEXOG4Ir:XClCRMGhz6JOi4XMwXWoJHUYYnCgAJru

Score

10^/10

ratty discovery persistence rat trojan

Malware Config

Signatures

Ratty
Ratty is an open source Java Remote Access Tool.
trojan rat ratty

Ratty Rat payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/files/0x0007000000023221-15.dat	family_ratty

Drops startup file 1 IoCs

Processes:

java.exe

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.jar	java.exe

Loads dropped DLL 1 IoCs

Processes:

java.exe

pid	Process
208	java.exe

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

Processes:

icacls.exe

pid	Process
1176	icacls.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

REG.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3336304223-2978740688-3645194410-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.jar = "C:\\Users\\Admin\\AppData\\Roaming\\2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.jar"	REG.exe

Drops file in Program Files directory 12 IoCs

Processes:

java.exe

description	ioc	Process
File opened for modification	C:\Program Files\Java\jre-1.8\bin\dll\jvm.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\server\ntdll.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\dll\ntdll.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\symbols\dll\ntdll.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\server\jvm.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\server\dll\jvm.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\jvm.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\server\symbols\dll\ntdll.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\ntdll.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\server\symbols\dll\jvm.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\symbols\dll\jvm.pdb	java.exe
File opened for modification	C:\Program Files\Java\jre-1.8\bin\server\dll\ntdll.pdb	java.exe

Modifies registry class 2 IoCs

Processes:

java.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance\	java.exe
Key created	\REGISTRY\USER\S-1-5-21-3336304223-2978740688-3645194410-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\	java.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

Processes:

REG.exe

pid	Process
2004	REG.exe

Suspicious use of SetWindowsHookEx 7 IoCs

Processes:

java.exe

pid	Process
208	java.exe
208	java.exe
208	java.exe
208	java.exe
208	java.exe
208	java.exe
208	java.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

java.exe

description	pid	Process	procid_target
PID 208 wrote to memory of 1176	208	java.exe	85
PID 208 wrote to memory of 1176	208	java.exe	85
PID 208 wrote to memory of 2004	208	java.exe	91
PID 208 wrote to memory of 2004	208	java.exe	91
PID 208 wrote to memory of 2504	208	java.exe	87
PID 208 wrote to memory of 2504	208	java.exe	87
PID 208 wrote to memory of 3308	208	java.exe	90
PID 208 wrote to memory of 3308	208	java.exe	90

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Processes:

attrib.exeattrib.exe

pid	Process
2504	attrib.exe
3308	attrib.exe

C:\Program Files (x86)\Common Files\Oracle\Java\javapath\java.exe
java -jar C:\Users\Admin\AppData\Local\Temp\2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.jar
1⤵
- Drops startup file
- Loads dropped DLL
- Drops file in Program Files directory
- Modifies registry class
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:208
- C:\Windows\system32\icacls.exe
  C:\Windows\system32\icacls.exe C:\ProgramData\Oracle\Java\.oracle_jre_usage /grant "everyone":(OI)(CI)M
  2⤵
  - Modifies file permissions
  PID:1176
- C:\Windows\SYSTEM32\attrib.exe
  attrib +H C:\Users\Admin\AppData\Roaming\2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.jar
  2⤵
  - Views/modifies file attributes
  PID:2504
- C:\Windows\SYSTEM32\attrib.exe
  attrib +H C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.jar
  2⤵
  - Views/modifies file attributes
  PID:3308
- C:\Windows\SYSTEM32\REG.exe
  REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v "2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.jar" /d "C:\Users\Admin\AppData\Roaming\2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.jar" /f
  2⤵
  - Adds Run key to start application
  - Modifies registry key
  PID:2004

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

File and Directory Permissions Modification

1

T1222

Hide Artifacts

1

T1564

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\Oracle\Java\.oracle_jre_usage\3903daac9bc4a3b7.timestamp

Filesize
46B

MD5
af3c9f315aa092aafe024dde6dff2719

SHA1
a5ebf4ff87b70996878ea99ef0cf8f6b4c46b1a9

SHA256
80bda6f5ba752523f6ee8f1c8e2e70828bcb1186108d81702cdf54625430efaf

SHA512
6c858c142e00ef95c763060ea43abc929f405473764b8543ee8e105a58e91ece94dcf29f5686d7ba059c3cd8b0403abe8e0dfa708fc2be811018ef6675c5857b

Download Submit
C:\Users\Admin\AppData\Local\Temp\JNativeHook-7432773EB4D09DC286D43FCC77DDB0E1E3BCE2B4.dll

Filesize
83KB

MD5
55f4de7f270663b3dc712b8c9eed422a

SHA1
7432773eb4d09dc286d43fcc77ddb0e1e3bce2b4

SHA256
47c2871dff8948de40424df497962ea6167c56bd4d487dd2e660aa2837485e25

SHA512
9da5efb0236b3bb4ec72d07bfd70a9e3f373df95d97c825513babd43d2b91c8669e28f3464173e789dad092ea48fc8d32a9d11a6d5c8d9beeabd33860ce6a996

Download Submit
C:\Users\Admin\AppData\Roaming\2023-FILES-MY1040-w2-IRS-letter-1099r_PDF.jar

Filesize
761KB

MD5
22e4d501be6ca69e29bc2a21782bd9e1

SHA1
93bd6f32a6afec897679ec96feb72627ea79d6ef

SHA256
1b7560d64e9fc2a468cc3e251669dd05df851f6432b8f3c373f06bd6aaf82d31

SHA512
f4b836bc1aaaece82e2ef590bb214227c23578d57f8e4caf6778f269b85b4337dda99a8f43cb5d286b44528c8d7ac25e6d42a899a98dcdc6047aeb59fdea3c83

Download Submit
memory/208-30-0x000001351A330000-0x000001351A331000-memory.dmp

Filesize
4KB

Download
memory/208-20-0x000001351A330000-0x000001351A331000-memory.dmp

Filesize
4KB

Download
memory/208-14-0x000001351A330000-0x000001351A331000-memory.dmp

Filesize
4KB

Download
memory/208-4-0x000001351BB20000-0x000001351CB20000-memory.dmp

Filesize
16.0MB

Download
memory/208-41-0x000001351A330000-0x000001351A331000-memory.dmp

Filesize
4KB

Download
memory/208-44-0x000001351A330000-0x000001351A331000-memory.dmp

Filesize
4KB

Download
memory/208-46-0x0000000065E40000-0x0000000065E55000-memory.dmp

Filesize
84KB

Download
memory/208-63-0x000001351A330000-0x000001351A331000-memory.dmp

Filesize
4KB

Download
memory/208-64-0x0000000065E40000-0x0000000065E55000-memory.dmp

Filesize
84KB

Download
memory/208-68-0x000001351A330000-0x000001351A331000-memory.dmp

Filesize
4KB

Download
memory/208-75-0x0000000065E40000-0x0000000065E55000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads