isrstealer | c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88

General

Target

c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe
Size

385KB
MD5

651b487fd423ec8448f11d23f500ec10
SHA1

da43197862d2a936b55f96901d12c87f0db983d8
SHA256

c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88
SHA512

bf3508bb2719968aa1b924a073f5e67ac901b26adf1e1b0f834260e3618066cad1aa5029769b539d579408aa80c6c81d07b55328868c778ff50a8ff73dfece1b
SSDEEP

6144:Oex5IamdAAdX+UkKK0r6vpjzWPu9XQRXKJYO3snCo9UJPHmViI:N5IaiAALKmWJWPyXkrksnCWyO

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/4504-138-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4504-149-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4504-151-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4504-159-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/2332-156-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/2332-157-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/2332-158-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/2332-156-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/2332-157-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/2332-158-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3068-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3068-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3068-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3068-148-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2332-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2332-155-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2332-156-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2332-157-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2332-158-0x0000000000400000-0x000000000041F000-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-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1824 set thread context of 4504	1824	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	83
PID 4504 set thread context of 3068	4504	vbc.exe	84
PID 4504 set thread context of 2332	4504	vbc.exe	89

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.new	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.new	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4504	vbc.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1824 wrote to memory of 4504	1824	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	83
PID 1824 wrote to memory of 4504	1824	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	83
PID 1824 wrote to memory of 4504	1824	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	83
PID 1824 wrote to memory of 4504	1824	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	83
PID 1824 wrote to memory of 4504	1824	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	83
PID 1824 wrote to memory of 4504	1824	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	83
PID 1824 wrote to memory of 4504	1824	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	83
PID 1824 wrote to memory of 4504	1824	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	83
PID 4504 wrote to memory of 3068	4504	vbc.exe	84
PID 4504 wrote to memory of 3068	4504	vbc.exe	84
PID 4504 wrote to memory of 3068	4504	vbc.exe	84
PID 4504 wrote to memory of 3068	4504	vbc.exe	84
PID 4504 wrote to memory of 3068	4504	vbc.exe	84
PID 4504 wrote to memory of 3068	4504	vbc.exe	84
PID 4504 wrote to memory of 3068	4504	vbc.exe	84
PID 4504 wrote to memory of 3068	4504	vbc.exe	84
PID 4504 wrote to memory of 2332	4504	vbc.exe	89
PID 4504 wrote to memory of 2332	4504	vbc.exe	89
PID 4504 wrote to memory of 2332	4504	vbc.exe	89
PID 4504 wrote to memory of 2332	4504	vbc.exe	89
PID 4504 wrote to memory of 2332	4504	vbc.exe	89
PID 4504 wrote to memory of 2332	4504	vbc.exe	89
PID 4504 wrote to memory of 2332	4504	vbc.exe	89
PID 4504 wrote to memory of 2332	4504	vbc.exe	89

C:\Users\Admin\AppData\Local\Temp\c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe
"C:\Users\Admin\AppData\Local\Temp\c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe"
1⤵
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:1824
- 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:4504
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\n8jQe6VO9X.ini"
    3⤵
    PID:3068
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tKFhu4wC25.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:2332

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

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\n8jQe6VO9X.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1824-136-0x0000000074E50000-0x0000000075401000-memory.dmp

Filesize
5.7MB

Download
memory/1824-135-0x0000000074E50000-0x0000000075401000-memory.dmp

Filesize
5.7MB

Download
memory/1824-145-0x0000000074E50000-0x0000000075401000-memory.dmp

Filesize
5.7MB

Download
memory/2332-158-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2332-157-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2332-156-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2332-155-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2332-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3068-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3068-148-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3068-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3068-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4504-149-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4504-151-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4504-138-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4504-159-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

Sharing