isrstealer | 16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae

General

Target

16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe
Size

339KB
MD5

a2cf6d18298eb04d2959f5a6c70099d3
SHA1

87e5e13e2d434a8d61988df6bd401ea27b354f8f
SHA256

16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae
SHA512

8c32f78af6945ab660f7277e58b9d17a5df96327b14d55dde2c5418a782d871cacca27f150f504c8e32ad6129ded765fb5b3df12d055087b36db40fbb2555281
SSDEEP

6144:G8cPjWN+vQIMmBhnNMIRW6qS9JK6n0GbFL/dxVjiN7nfP8DHY:G8aSN+vQtm/DqkjFLFLwfPK4

Score

10^/10

isrstealer collection 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 6 IoCs

resource	yara_rule
behavioral1/memory/1728-58-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1728-60-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1728-61-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1728-70-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1728-78-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1728-86-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/2024-84-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/2024-85-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/2024-84-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/2024-85-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1732-67-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1732-72-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1732-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1732-74-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1732-75-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2024-79-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2024-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2024-84-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2024-85-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	svchost.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1600 set thread context of 1728	1600	16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe	28
PID 1728 set thread context of 1732	1728	svchost.exe	29
PID 1728 set thread context of 2024	1728	svchost.exe	32

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1728	svchost.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1600 wrote to memory of 1728	1600	16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe	28
PID 1600 wrote to memory of 1728	1600	16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe	28
PID 1600 wrote to memory of 1728	1600	16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe	28
PID 1600 wrote to memory of 1728	1600	16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe	28
PID 1600 wrote to memory of 1728	1600	16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe	28
PID 1600 wrote to memory of 1728	1600	16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe	28
PID 1600 wrote to memory of 1728	1600	16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe	28
PID 1600 wrote to memory of 1728	1600	16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe	28
PID 1728 wrote to memory of 1732	1728	svchost.exe	29
PID 1728 wrote to memory of 1732	1728	svchost.exe	29
PID 1728 wrote to memory of 1732	1728	svchost.exe	29
PID 1728 wrote to memory of 1732	1728	svchost.exe	29
PID 1728 wrote to memory of 1732	1728	svchost.exe	29
PID 1728 wrote to memory of 1732	1728	svchost.exe	29
PID 1728 wrote to memory of 1732	1728	svchost.exe	29
PID 1728 wrote to memory of 1732	1728	svchost.exe	29
PID 1728 wrote to memory of 1732	1728	svchost.exe	29
PID 1728 wrote to memory of 2024	1728	svchost.exe	32
PID 1728 wrote to memory of 2024	1728	svchost.exe	32
PID 1728 wrote to memory of 2024	1728	svchost.exe	32
PID 1728 wrote to memory of 2024	1728	svchost.exe	32
PID 1728 wrote to memory of 2024	1728	svchost.exe	32
PID 1728 wrote to memory of 2024	1728	svchost.exe	32
PID 1728 wrote to memory of 2024	1728	svchost.exe	32
PID 1728 wrote to memory of 2024	1728	svchost.exe	32
PID 1728 wrote to memory of 2024	1728	svchost.exe	32

C:\Users\Admin\AppData\Local\Temp\16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe
"C:\Users\Admin\AppData\Local\Temp\16b775d01e522b0631272e77daa42cb756e53b52528545f07a1d5f712227fdae.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1600
- C:\Windows\SysWOW64\svchost.exe
  "C:\Windows\system32\svchost.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1728
- - C:\Windows\SysWOW64\svchost.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\5Ckq2qR01t.ini"
    3⤵
    PID:1732
- - C:\Windows\SysWOW64\svchost.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\6ao2rMdNiO.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:2024

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\5Ckq2qR01t.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1600-66-0x0000000074100000-0x00000000746AB000-memory.dmp

Filesize
5.7MB

Download
memory/1600-54-0x00000000752B1000-0x00000000752B3000-memory.dmp

Filesize
8KB

Download
memory/1728-78-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1728-60-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1728-58-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1728-86-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1728-55-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1728-70-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1728-56-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1732-74-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1732-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1732-75-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1732-72-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1732-67-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2024-79-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2024-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2024-84-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2024-85-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

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