isrstealer | 4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1

General

Target

4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe
Size

344KB
MD5

87a98db6af2353cc097dc85484f97ff8
SHA1

433ef975fd9cffd9ee28d87a01bc963392fb2acb
SHA256

4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1
SHA512

da11af4d38b674249ff2368e4b90dcfd3d4fced3ebcac12a14aa22623f0d789ecdb386083181d5ca14040003854deaf194f167606bcbf6bcf5b2d2b696d7535c
SSDEEP

6144:Toe/JOO2Dmb894GIQzEmYrPUwWCh4ePil1CV+Pk0ylQLPJ2tPHQtmAx:ToecDe894ZQzrYrX5h4eKXCVyiEBwPHs

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
behavioral1/memory/1072-60-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1072-62-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1072-63-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1072-85-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1372-83-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1372-84-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/1372-83-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1372-84-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1412-69-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1412-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1412-74-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1412-75-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1412-76-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1372-78-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1372-82-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1372-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1372-84-0x0000000000400000-0x000000000041F000-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-1-5-21-575491160-2295418218-1540667289-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1704 set thread context of 1072	1704	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	28
PID 1072 set thread context of 1412	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	29
PID 1072 set thread context of 1372	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	30

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1704	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1704 wrote to memory of 1072	1704	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	28
PID 1704 wrote to memory of 1072	1704	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	28
PID 1704 wrote to memory of 1072	1704	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	28
PID 1704 wrote to memory of 1072	1704	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	28
PID 1704 wrote to memory of 1072	1704	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	28
PID 1704 wrote to memory of 1072	1704	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	28
PID 1704 wrote to memory of 1072	1704	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	28
PID 1704 wrote to memory of 1072	1704	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	28
PID 1072 wrote to memory of 1412	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	29
PID 1072 wrote to memory of 1412	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	29
PID 1072 wrote to memory of 1412	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	29
PID 1072 wrote to memory of 1412	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	29
PID 1072 wrote to memory of 1412	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	29
PID 1072 wrote to memory of 1412	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	29
PID 1072 wrote to memory of 1412	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	29
PID 1072 wrote to memory of 1412	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	29
PID 1072 wrote to memory of 1412	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	29
PID 1072 wrote to memory of 1372	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	30
PID 1072 wrote to memory of 1372	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	30
PID 1072 wrote to memory of 1372	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	30
PID 1072 wrote to memory of 1372	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	30
PID 1072 wrote to memory of 1372	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	30
PID 1072 wrote to memory of 1372	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	30
PID 1072 wrote to memory of 1372	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	30
PID 1072 wrote to memory of 1372	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	30
PID 1072 wrote to memory of 1372	1072	4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe	30

C:\Users\Admin\AppData\Local\Temp\4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe
"C:\Users\Admin\AppData\Local\Temp\4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1704
- C:\Users\Admin\AppData\Local\Temp\4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe
  "C:\Users\Admin\AppData\Local\Temp\4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1072
- - C:\Users\Admin\AppData\Local\Temp\4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\NN5FZ3T792.ini"
    3⤵
    PID:1412
- - C:\Users\Admin\AppData\Local\Temp\4309cf5fb9b2df3f0697a704dc8fa1764ecb5fc0c89ec0a49e4d62e7746650e1.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\21quMaoIXB.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1372

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

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\NN5FZ3T792.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1072-60-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1072-58-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1072-57-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1072-85-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1072-62-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1372-78-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1372-84-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1372-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1372-82-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1412-75-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1412-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1412-76-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1412-74-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1412-69-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1704-55-0x0000000074C90000-0x000000007523B000-memory.dmp

Filesize
5.7MB

Download
memory/1704-65-0x0000000074C90000-0x000000007523B000-memory.dmp

Filesize
5.7MB

Download
memory/1704-56-0x0000000074C90000-0x000000007523B000-memory.dmp

Filesize
5.7MB

Download
memory/1704-54-0x0000000076191000-0x0000000076193000-memory.dmp

Filesize
8KB

Download

Analysis

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