isrstealer | 571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7

General

Target

571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe
Size

377KB
MD5

388ceb608b170c58c29f10ddeeb3c9f3
SHA1

24edfd36e667f0ba3fc56a7b3113691bd62ddf68
SHA256

571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7
SHA512

72f89e463ef5fb0d73729095f0bf9206b693b82245973ae98491d73a8a5d01c91463504cc27ea1acdddac9b17177da3da4f9e8b1d5acf02e6f20e47948ed40d8
SSDEEP

6144:ulGAxVnthTDjyTiv+4PCbm2D8LB+//wp4kfU0VW3jEDW+KQveg177cfwW+:NYVnTXeTZb/4g/KdXcADpeg177cfe

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 4 IoCs

resource	yara_rule
behavioral2/memory/5024-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/5024-142-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/5024-148-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/5024-155-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/2472-153-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/2472-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/2472-153-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/2472-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2084-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2084-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2084-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2084-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2472-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2472-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2472-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2472-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

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	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3436 set thread context of 5024	3436	571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe	80
PID 5024 set thread context of 2084	5024	vbc.exe	81
PID 5024 set thread context of 2472	5024	vbc.exe	82

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3436	571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5024	vbc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 3436 wrote to memory of 5024	3436	571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe	80
PID 3436 wrote to memory of 5024	3436	571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe	80
PID 3436 wrote to memory of 5024	3436	571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe	80
PID 3436 wrote to memory of 5024	3436	571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe	80
PID 3436 wrote to memory of 5024	3436	571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe	80
PID 3436 wrote to memory of 5024	3436	571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe	80
PID 3436 wrote to memory of 5024	3436	571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe	80
PID 5024 wrote to memory of 2084	5024	vbc.exe	81
PID 5024 wrote to memory of 2084	5024	vbc.exe	81
PID 5024 wrote to memory of 2084	5024	vbc.exe	81
PID 5024 wrote to memory of 2084	5024	vbc.exe	81
PID 5024 wrote to memory of 2084	5024	vbc.exe	81
PID 5024 wrote to memory of 2084	5024	vbc.exe	81
PID 5024 wrote to memory of 2084	5024	vbc.exe	81
PID 5024 wrote to memory of 2084	5024	vbc.exe	81
PID 5024 wrote to memory of 2472	5024	vbc.exe	82
PID 5024 wrote to memory of 2472	5024	vbc.exe	82
PID 5024 wrote to memory of 2472	5024	vbc.exe	82
PID 5024 wrote to memory of 2472	5024	vbc.exe	82
PID 5024 wrote to memory of 2472	5024	vbc.exe	82
PID 5024 wrote to memory of 2472	5024	vbc.exe	82
PID 5024 wrote to memory of 2472	5024	vbc.exe	82
PID 5024 wrote to memory of 2472	5024	vbc.exe	82

C:\Users\Admin\AppData\Local\Temp\571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe
"C:\Users\Admin\AppData\Local\Temp\571aac6c9270108cccb93e5326ac378aca0e33b8cd3dd235f0776aaa3c7572c7.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3436
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5024
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\136wB8Yqtw.ini"
    3⤵
    PID:2084
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\1q1ZpjjTGH.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:2472

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

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\136wB8Yqtw.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/2084-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2084-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2084-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2084-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2472-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2472-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2472-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2472-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3436-138-0x00000000750D0000-0x0000000075681000-memory.dmp

Filesize
5.7MB

Download
memory/3436-132-0x00000000750D0000-0x0000000075681000-memory.dmp

Filesize
5.7MB

Download
memory/3436-133-0x00000000750D0000-0x0000000075681000-memory.dmp

Filesize
5.7MB

Download
memory/5024-148-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/5024-142-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/5024-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/5024-155-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

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