isrstealer | 8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
03-12-2022 06:17

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General

Target

8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81.exe
Size

915KB
MD5

d5517bed2e8eebb29ed1ac0df1fc0f27
SHA1

a216d852812987b7026148f5cb3df3ebf0d64c80
SHA256

8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81
SHA512

6d39794b8e400701593ec720ab8b6d211804f9a80634a4c68d301fb114054b40c87def9a915c76a226635238c094f0faab402437a7c738cf744e31900580a1c1
SSDEEP

12288:J6Wq4aaE6KwyF5L0Y2D1PqLCL0AyP01MzKoKqEJlOAH3BxvvQTgaA:fthEVaPqLCLqEMuoKqWlOAXzxaA

Score

10^/10

isrstealer 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 4 IoCs

resource	yara_rule
behavioral2/memory/2180-134-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/2180-136-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/2180-146-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/2180-148-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4776-132-0x0000000000400000-0x000000000056B000-memory.dmp	upx
behavioral2/memory/4876-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4876-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4876-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4876-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4776-144-0x0000000000400000-0x000000000056B000-memory.dmp	upx

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral2/memory/4776-144-0x0000000000400000-0x000000000056B000-memory.dmp	autoit_exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4776 set thread context of 2180	4776	8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81.exe	83
PID 2180 set thread context of 4876	2180	calc.exe	84

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

System Information Discovery
T1082

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2180	calc.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 4776 wrote to memory of 2180	4776	8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81.exe	83
PID 4776 wrote to memory of 2180	4776	8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81.exe	83
PID 4776 wrote to memory of 2180	4776	8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81.exe	83
PID 4776 wrote to memory of 2180	4776	8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81.exe	83
PID 4776 wrote to memory of 2180	4776	8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81.exe	83
PID 2180 wrote to memory of 4876	2180	calc.exe	84
PID 2180 wrote to memory of 4876	2180	calc.exe	84
PID 2180 wrote to memory of 4876	2180	calc.exe	84
PID 2180 wrote to memory of 4876	2180	calc.exe	84
PID 2180 wrote to memory of 4876	2180	calc.exe	84
PID 2180 wrote to memory of 4876	2180	calc.exe	84
PID 2180 wrote to memory of 4876	2180	calc.exe	84
PID 2180 wrote to memory of 4876	2180	calc.exe	84

C:\Users\Admin\AppData\Local\Temp\8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81.exe
"C:\Users\Admin\AppData\Local\Temp\8b04442da25cfa5698f2ceddb2137c1306d84880a04fa2a2d662090fe23e3e81.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4776
- C:\Windows\SysWOW64\calc.exe
  "C:\Windows\SysWOW64\calc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2180
- - C:\Windows\SysWOW64\calc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
    3⤵
    PID:4876

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/2180-146-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/2180-134-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/2180-136-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/2180-148-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/4776-144-0x0000000000400000-0x000000000056B000-memory.dmp

Filesize
1.4MB

Download
memory/4776-132-0x0000000000400000-0x000000000056B000-memory.dmp

Filesize
1.4MB

Download
memory/4876-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4876-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4876-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4876-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download