isrstealer | e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0

General

Target

e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
Size

670KB
MD5

5aa5d008136ee1d8ff62ed43d542347e
SHA1

bed4c146c4ad8000ce9b7d3ebac027cf98190384
SHA256

e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0
SHA512

f2e45c7d27bb72afc0dde33b6837c0ed842342e93e3894db0d665c97676346f5cd2c7e277bbe14b6279635cfca49de550ee6a43dfb5abcde7f2cacd8fcde727b
SSDEEP

12288:DU5AxENsBnveIebg0zOOeE32U/0XjjWY0nPVSr1xAFbao:g5cvEbNyOeETEjKYEPVSZK5

Score

10^/10

isrstealer persistence spyware stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 5 IoCs

resource	yara_rule
behavioral2/memory/4940-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4940-137-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4940-146-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4940-148-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4940-151-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "\"C:\\Users\\Admin\\AppData\\Roaming\\4SiwoU1Y1RW528k2\\seODLmbiiYbs.exe\",explorer.exe"	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/3568-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3568-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3568-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3568-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2064 set thread context of 4940	2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	80
PID 4940 set thread context of 3568	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	81
PID 4940 set thread context of 4644	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	83

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3128	4644	WerFault.exe	83

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2064 wrote to memory of 4940	2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	80
PID 2064 wrote to memory of 4940	2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	80
PID 2064 wrote to memory of 4940	2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	80
PID 2064 wrote to memory of 4940	2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	80
PID 2064 wrote to memory of 4940	2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	80
PID 2064 wrote to memory of 4940	2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	80
PID 2064 wrote to memory of 4940	2064	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	80
PID 4940 wrote to memory of 3568	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	81
PID 4940 wrote to memory of 3568	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	81
PID 4940 wrote to memory of 3568	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	81
PID 4940 wrote to memory of 3568	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	81
PID 4940 wrote to memory of 3568	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	81
PID 4940 wrote to memory of 3568	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	81
PID 4940 wrote to memory of 3568	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	81
PID 4940 wrote to memory of 3568	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	81
PID 4940 wrote to memory of 4644	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	83
PID 4940 wrote to memory of 4644	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	83
PID 4940 wrote to memory of 4644	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	83
PID 4940 wrote to memory of 4644	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	83
PID 4940 wrote to memory of 4644	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	83
PID 4940 wrote to memory of 4644	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	83
PID 4940 wrote to memory of 4644	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	83
PID 4940 wrote to memory of 4644	4940	e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe	83

C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
"C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe"
1⤵
- Modifies WinLogon for persistence
- Drops file in Drivers directory
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2064
- C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
  "C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4940
- - C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\YWau0QHqO0.ini"
    3⤵
    PID:3568
- - C:\Users\Admin\AppData\Local\Temp\e3fd3e05a7bd5a85af2e0ee264d73eb76af885b3d2b054f6d4caa8e3e91118e0.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\FhnBFjpq8j.ini"
    3⤵
    PID:4644
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4644 -s 80
      4⤵
      Program crash
      PID:3128

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4644 -ip 4644
1⤵
PID:628

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\YWau0QHqO0.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/2064-132-0x00000000749B0000-0x0000000074F61000-memory.dmp

Filesize
5.7MB

Download
memory/2064-133-0x00000000749B0000-0x0000000074F61000-memory.dmp

Filesize
5.7MB

Download
memory/3568-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3568-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3568-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3568-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4940-137-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4940-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4940-146-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4940-148-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4940-151-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

Sharing