isrstealer | 4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68

Analysis

max time kernel
149s
max time network
179s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
12/07/2022, 12:35

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General

Target
4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
Size 426KB
Sample220712-psk7tsdah8
SHA256 4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68
MD5 0c126915720c2dfabaa824598a7aa0c6
SHA1 777c3fdb4c8f7572687cb107040103e796996849
SHA512 254bfdcb8465f01d3b321a2c5ef347f41f9c4f2e822fb9d64fc1263aa39c65d7cdbdb62c897ad4057cc6ce103959020eeb8a638c536528a9cf2b94f0935fe18e
MD5 SHA1 SHA512

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/4224-133-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4224-137-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4224-149-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4224-159-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3648-156-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3648-157-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3648-158-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/3648-156-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3648-157-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3648-158-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 3 IoCs

pid	Process
4224	svhost.exe
4508	svhost.exe
3648	svhost.exe

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4508-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4508-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4508-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4508-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3648-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3648-155-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3648-156-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3648-157-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3648-158-0x0000000000400000-0x000000000041F000-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-1-5-21-3751123196-3323558407-1869646069-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	svhost.exe

Drops desktop.ini file(s) 2 IoCs

description	ioc	Process
File created	C:\Windows\assembly\Desktop.ini	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3688 set thread context of 4224	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	85
PID 4224 set thread context of 4508	4224	svhost.exe	86
PID 4224 set thread context of 3648	4224	svhost.exe	87

Drops file in Windows directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\assembly	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
File created	C:\Windows\assembly\Desktop.ini	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
File opened for modification	C:\Windows\assembly\Desktop.ini	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4224	svhost.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3688 wrote to memory of 2532	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	83
PID 3688 wrote to memory of 2532	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	83
PID 3688 wrote to memory of 2532	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	83
PID 3688 wrote to memory of 4224	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	85
PID 3688 wrote to memory of 4224	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	85
PID 3688 wrote to memory of 4224	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	85
PID 3688 wrote to memory of 4224	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	85
PID 3688 wrote to memory of 4224	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	85
PID 3688 wrote to memory of 4224	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	85
PID 3688 wrote to memory of 4224	3688	4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe	85
PID 4224 wrote to memory of 4508	4224	svhost.exe	86
PID 4224 wrote to memory of 4508	4224	svhost.exe	86
PID 4224 wrote to memory of 4508	4224	svhost.exe	86
PID 4224 wrote to memory of 4508	4224	svhost.exe	86
PID 4224 wrote to memory of 4508	4224	svhost.exe	86
PID 4224 wrote to memory of 4508	4224	svhost.exe	86
PID 4224 wrote to memory of 4508	4224	svhost.exe	86
PID 4224 wrote to memory of 4508	4224	svhost.exe	86
PID 4224 wrote to memory of 3648	4224	svhost.exe	87
PID 4224 wrote to memory of 3648	4224	svhost.exe	87
PID 4224 wrote to memory of 3648	4224	svhost.exe	87
PID 4224 wrote to memory of 3648	4224	svhost.exe	87
PID 4224 wrote to memory of 3648	4224	svhost.exe	87
PID 4224 wrote to memory of 3648	4224	svhost.exe	87
PID 4224 wrote to memory of 3648	4224	svhost.exe	87
PID 4224 wrote to memory of 3648	4224	svhost.exe	87

C:\Users\Admin\AppData\Local\Temp\4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe
"C:\Users\Admin\AppData\Local\Temp\4b4df849759c4377308e8126e7baee0bf0384fed2dfe03e9273f7cc9069c5b68.exe"
1⤵
- Drops desktop.ini file(s)
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3688
- C:\Windows\SysWOW64\cmd.exe
  "cmd.exe"
  2⤵
  PID:2532
- C:\Users\Admin\AppData\Local\Temp\svhost.exe
  "C:\Users\Admin\AppData\Local\Temp\svhost.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4224
- - C:\Users\Admin\AppData\Local\Temp\svhost.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\iAF4B32jLG.ini"
    3⤵
    - Executes dropped EXE
    PID:4508
- - C:\Users\Admin\AppData\Local\Temp\svhost.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\RXARLrLgS6.ini"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook accounts
    PID:3648

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

iAF4B32jLG.ini

Path C:\Users\Admin\AppData\Local\Temp\iAF4B32jLG.ini
Size 5B
SHA256 fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba
MD5 d1ea279fb5559c020a1b4137dc4de237
SHA1 db6f8988af46b56216a6f0daf95ab8c9bdb57400
SHA512 720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3
MD5 SHA1 SHA512

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svhost.exe

Path C:\Users\Admin\AppData\Local\Temp\svhost.exe
Size 1.6MB
SHA256 e8b5da3394bbdd7868122ffd88d9d06afe31bd69d656857910d2f820c32d0efa
MD5 1c9ff7df71493896054a91bee0322ebf
SHA1 38f1c85965d58b910d8e8381b6b1099d5dfcbfe4
SHA512 aa0def62b663743e6c3c022182b35cff33cb9abf08453d5098f3c5d32b2a8b0cd1cc5de64b93e39680c1d1396fef1fd50b642ca3ea4ba1f6d1078321d96916ab
SSDEEP 24576:D2Jdi2osRvHJT8EZwpqy4JXxDsv6TRrgGdbG4VKMhyMvopZ:DMiQB8EZwmWv6TrGYXhyMvq
MD5 SHA1 SHA512 SSDEEP

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svhost.exe

Path C:\Users\Admin\AppData\Local\Temp\svhost.exe
Size 1.6MB
SHA256 e8b5da3394bbdd7868122ffd88d9d06afe31bd69d656857910d2f820c32d0efa
MD5 1c9ff7df71493896054a91bee0322ebf
SHA1 38f1c85965d58b910d8e8381b6b1099d5dfcbfe4
SHA512 aa0def62b663743e6c3c022182b35cff33cb9abf08453d5098f3c5d32b2a8b0cd1cc5de64b93e39680c1d1396fef1fd50b642ca3ea4ba1f6d1078321d96916ab
SSDEEP 24576:D2Jdi2osRvHJT8EZwpqy4JXxDsv6TRrgGdbG4VKMhyMvopZ:DMiQB8EZwmWv6TrGYXhyMvq
MD5 SHA1 SHA512 SSDEEP

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svhost.exe

Path C:\Users\Admin\AppData\Local\Temp\svhost.exe
Size 1.6MB
SHA256 e8b5da3394bbdd7868122ffd88d9d06afe31bd69d656857910d2f820c32d0efa
MD5 1c9ff7df71493896054a91bee0322ebf
SHA1 38f1c85965d58b910d8e8381b6b1099d5dfcbfe4
SHA512 aa0def62b663743e6c3c022182b35cff33cb9abf08453d5098f3c5d32b2a8b0cd1cc5de64b93e39680c1d1396fef1fd50b642ca3ea4ba1f6d1078321d96916ab
SSDEEP 24576:D2Jdi2osRvHJT8EZwpqy4JXxDsv6TRrgGdbG4VKMhyMvopZ:DMiQB8EZwmWv6TrGYXhyMvq
MD5 SHA1 SHA512 SSDEEP

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svhost.exe

Path C:\Users\Admin\AppData\Local\Temp\svhost.exe
Size 1.6MB
SHA256 e8b5da3394bbdd7868122ffd88d9d06afe31bd69d656857910d2f820c32d0efa
MD5 1c9ff7df71493896054a91bee0322ebf
SHA1 38f1c85965d58b910d8e8381b6b1099d5dfcbfe4
SHA512 aa0def62b663743e6c3c022182b35cff33cb9abf08453d5098f3c5d32b2a8b0cd1cc5de64b93e39680c1d1396fef1fd50b642ca3ea4ba1f6d1078321d96916ab
SSDEEP 24576:D2Jdi2osRvHJT8EZwpqy4JXxDsv6TRrgGdbG4VKMhyMvopZ:DMiQB8EZwmWv6TrGYXhyMvq
MD5 SHA1 SHA512 SSDEEP

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memory/3648-157-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/3648-158-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/3648-156-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/3648-155-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/3648-152-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/3688-130-0x0000000074DD0000-0x0000000075381000-memory.dmp

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memory/3688-150-0x0000000074DD0000-0x0000000075381000-memory.dmp

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memory/3688-147-0x0000000074DD0000-0x0000000075381000-memory.dmp

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memory/4224-137-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/4224-149-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/4224-133-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/4224-159-0x0000000000400000-0x0000000000442000-memory.dmp

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memory/4508-146-0x0000000000400000-0x0000000000453000-memory.dmp

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memory/4508-145-0x0000000000400000-0x0000000000453000-memory.dmp

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memory/4508-144-0x0000000000400000-0x0000000000453000-memory.dmp

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memory/4508-141-0x0000000000400000-0x0000000000453000-memory.dmp

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