isrstealer | b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60

General

Target

b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe
Size

1.1MB
MD5

e0d065e59e9920927f8e305b6dc12ddf
SHA1

3529cabd429339b3c1201adbff22ef8584c265c9
SHA256

b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60
SHA512

99765ffb4ba662809b7df5244140432daaf04fdaf7e6ebec2deb4a1d2c94c8b0be863240a60367ee1dd17123a5ce4bd7f74f3eb0bfb5ae60ec6646a483f0d1c9
SSDEEP

24576:KaHMv6Corjqny/Q5yKOgtq7zyDiJMk2wQocwZPXK:K1vqjd/Q5yTMC2iJMdwQtw5XK

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 3 IoCs

resource	yara_rule
behavioral2/memory/3936-133-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/3936-137-0x0000000000400000-0x0000000000432000-memory.dmp	family_isrstealer
behavioral2/memory/3936-145-0x0000000000400000-0x0000000000432000-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/816-139-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/816-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/816-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/816-143-0x0000000000400000-0x0000000000453000-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 4380 set thread context of 3936	4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	81
PID 3936 set thread context of 816	3936	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	82

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 FindShellTrayWindow 3 IoCs

pid	Process
4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe
4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe
4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe
4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe
4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3936	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4380 wrote to memory of 3936	4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	81
PID 4380 wrote to memory of 3936	4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	81
PID 4380 wrote to memory of 3936	4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	81
PID 4380 wrote to memory of 3936	4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	81
PID 4380 wrote to memory of 3936	4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	81
PID 4380 wrote to memory of 3936	4380	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	81
PID 3936 wrote to memory of 816	3936	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	82
PID 3936 wrote to memory of 816	3936	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	82
PID 3936 wrote to memory of 816	3936	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	82
PID 3936 wrote to memory of 816	3936	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	82
PID 3936 wrote to memory of 816	3936	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	82
PID 3936 wrote to memory of 816	3936	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	82
PID 3936 wrote to memory of 816	3936	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	82
PID 3936 wrote to memory of 816	3936	b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe	82

C:\Users\Admin\AppData\Local\Temp\b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe
"C:\Users\Admin\AppData\Local\Temp\b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:4380
- C:\Users\Admin\AppData\Local\Temp\b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe
  "C:\Users\Admin\AppData\Local\Temp\b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3936
- - C:\Users\Admin\AppData\Local\Temp\b89e1c18c072fe32313eeb8a4d2337078c02ffa76ef5b03b2085acec887a0f60.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tmp.ini"
    3⤵
    PID:816

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\tmp.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/816-139-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/816-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/816-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/816-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3936-133-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/3936-137-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download
memory/3936-145-0x0000000000400000-0x0000000000432000-memory.dmp

Filesize
200KB

Download

Analysis

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