isrstealer | fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101

General

Target

fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe
Size

921KB
MD5

8d2e6aaf036b58a9add40aa5494341cc
SHA1

2eda98477ea42f59cbdea471381986822dbdf416
SHA256

fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101
SHA512

7aa1eee4f10ff010fc760e105bcadd03d8f1a5d3927cf736c77b3ef7c8d606b750a00d387b89982903d0b30af07eb92aaf3dc87c9e02a41ab2696dc1fbd8bbe0
SSDEEP

24576:uRmJkcoQricOIQxiZY1iaChSdwaPjstiPy+:7JZoQrbTFZY1iaCmGP+

Score

10^/10

isrstealer collection 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 4 IoCs

resource	yara_rule
behavioral2/memory/5108-133-0x0000000000400000-0x0000000000443000-memory.dmp	family_isrstealer
behavioral2/memory/5108-143-0x0000000000400000-0x0000000000443000-memory.dmp	family_isrstealer
behavioral2/memory/5108-145-0x0000000000400000-0x0000000000443000-memory.dmp	family_isrstealer
behavioral2/memory/5108-152-0x0000000000400000-0x0000000000443000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3536-150-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3536-151-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/3536-150-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3536-151-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1960-138-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1960-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1960-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1960-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3536-147-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3536-149-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3536-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3536-151-0x0000000000400000-0x000000000041F000-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

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3052 set thread context of 5108	3052	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	79
PID 5108 set thread context of 1960	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	80
PID 5108 set thread context of 3536	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	81

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
5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 3052 wrote to memory of 5108	3052	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	79
PID 3052 wrote to memory of 5108	3052	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	79
PID 3052 wrote to memory of 5108	3052	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	79
PID 3052 wrote to memory of 5108	3052	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	79
PID 3052 wrote to memory of 5108	3052	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	79
PID 5108 wrote to memory of 1960	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	80
PID 5108 wrote to memory of 1960	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	80
PID 5108 wrote to memory of 1960	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	80
PID 5108 wrote to memory of 1960	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	80
PID 5108 wrote to memory of 1960	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	80
PID 5108 wrote to memory of 1960	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	80
PID 5108 wrote to memory of 1960	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	80
PID 5108 wrote to memory of 1960	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	80
PID 5108 wrote to memory of 3536	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	81
PID 5108 wrote to memory of 3536	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	81
PID 5108 wrote to memory of 3536	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	81
PID 5108 wrote to memory of 3536	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	81
PID 5108 wrote to memory of 3536	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	81
PID 5108 wrote to memory of 3536	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	81
PID 5108 wrote to memory of 3536	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	81
PID 5108 wrote to memory of 3536	5108	fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe	81

C:\Users\Admin\AppData\Local\Temp\fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe
"C:\Users\Admin\AppData\Local\Temp\fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3052
- C:\Users\Admin\AppData\Local\Temp\fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe
  "C:\Users\Admin\AppData\Local\Temp\fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5108
- - C:\Users\Admin\AppData\Local\Temp\fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\0nnDPOtQRV.ini"
    3⤵
    PID:1960
- - C:\Users\Admin\AppData\Local\Temp\fe1b9b6ad75515cf48c104bccfb190a9cd472f39e2d35b8fb5d091525eb07101.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\mvfrHSDzki.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:3536

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

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1960-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1960-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1960-138-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1960-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3536-147-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3536-149-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3536-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3536-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/5108-145-0x0000000000400000-0x0000000000443000-memory.dmp

Filesize
268KB

Download
memory/5108-143-0x0000000000400000-0x0000000000443000-memory.dmp

Filesize
268KB

Download
memory/5108-133-0x0000000000400000-0x0000000000443000-memory.dmp

Filesize
268KB

Download
memory/5108-152-0x0000000000400000-0x0000000000443000-memory.dmp

Filesize
268KB

Download

Analysis

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