isrstealer | 3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279

General

Target

3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe
Size

955KB
MD5

0de19dc99ab1b79a28170a7da099b440
SHA1

6695d118f640e8be648055f4dbfd2e171a407b8f
SHA256

3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279
SHA512

c0a273437f6fc5889a8ea4da0dcee75a929d84042c41151a533f2ae5349fff921e3cf0dc4b4065bdfc6b07a7d5a584186ae81813628afbc0c48820318058a381
SSDEEP

24576:pRmJkcoQricOIQxiZY1iaYlgNeHIKqVqRE:mJZoQrbTFZY1iaYlgIHIbv

Score

10^/10

isrstealer 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 2 IoCs

resource	yara_rule
behavioral2/memory/4508-133-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4508-145-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4652-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4652-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4652-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4652-138-0x0000000000400000-0x0000000000453000-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 2 IoCs

description	pid	Process	procid_target
PID 2404 set thread context of 4508	2404	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	59
PID 4508 set thread context of 4652	4508	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	61

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
4508	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 2404 wrote to memory of 4508	2404	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	59
PID 2404 wrote to memory of 4508	2404	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	59
PID 2404 wrote to memory of 4508	2404	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	59
PID 2404 wrote to memory of 4508	2404	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	59
PID 2404 wrote to memory of 4508	2404	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	59
PID 4508 wrote to memory of 4652	4508	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	61
PID 4508 wrote to memory of 4652	4508	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	61
PID 4508 wrote to memory of 4652	4508	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	61
PID 4508 wrote to memory of 4652	4508	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	61
PID 4508 wrote to memory of 4652	4508	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	61
PID 4508 wrote to memory of 4652	4508	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	61
PID 4508 wrote to memory of 4652	4508	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	61
PID 4508 wrote to memory of 4652	4508	3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe	61

C:\Users\Admin\AppData\Local\Temp\3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe
"C:\Users\Admin\AppData\Local\Temp\3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2404
- C:\Users\Admin\AppData\Local\Temp\3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe
  "C:\Users\Admin\AppData\Local\Temp\3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4508
- - C:\Users\Admin\AppData\Local\Temp\3a91ebb3ba7b9ff34e7ae9196f1654785cbf96134950ae23b9432e4b47bf5279.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\0tFXKyAYDm.ini"
    3⤵
    PID:4652

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\0tFXKyAYDm.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/4508-133-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4508-143-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4508-145-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4652-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4652-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4652-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4652-138-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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