isrstealer | c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b

General

Target

c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe
Size

320KB
MD5

b9dcaaabf9f1b53c8bbb7217fbb492b7
SHA1

0d3ff7a06e48adc44f60c7dd04272eb0137cc951
SHA256

c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b
SHA512

20568b01a294ba8f3ec4fc849ebcb117b2ce3f92ba5d89e96fbe74f821471af7d565703b2a216b2386c75fb2b7f1b176d924729834ee1e9729ef43be9f810568
SSDEEP

6144:+l4lOFVO6wXgzJofMow/8RDExqYYI+04xOwI/GvdOwHs6mVZ2YRJl:+2lOFVO6x2C8RYD3xyhIOQwHGVZ7

Score

10^/10

isrstealer collection persistence 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/4640-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4640-142-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4640-148-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/4640-155-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/100-153-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/100-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/100-153-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/100-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3500-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3500-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3500-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3500-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/100-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/100-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/100-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/100-154-0x0000000000400000-0x000000000041F000-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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WinDefender = "C:\\Users\\Admin\\AppData\\Local\\Temp\\WinDefender.Exe"	c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1392 set thread context of 4640	1392	c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe	83
PID 4640 set thread context of 3500	4640	vbc.exe	84
PID 4640 set thread context of 100	4640	vbc.exe	85

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4640	vbc.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1392 wrote to memory of 4640	1392	c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe	83
PID 1392 wrote to memory of 4640	1392	c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe	83
PID 1392 wrote to memory of 4640	1392	c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe	83
PID 1392 wrote to memory of 4640	1392	c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe	83
PID 1392 wrote to memory of 4640	1392	c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe	83
PID 1392 wrote to memory of 4640	1392	c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe	83
PID 1392 wrote to memory of 4640	1392	c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe	83
PID 1392 wrote to memory of 4640	1392	c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe	83
PID 4640 wrote to memory of 3500	4640	vbc.exe	84
PID 4640 wrote to memory of 3500	4640	vbc.exe	84
PID 4640 wrote to memory of 3500	4640	vbc.exe	84
PID 4640 wrote to memory of 3500	4640	vbc.exe	84
PID 4640 wrote to memory of 3500	4640	vbc.exe	84
PID 4640 wrote to memory of 3500	4640	vbc.exe	84
PID 4640 wrote to memory of 3500	4640	vbc.exe	84
PID 4640 wrote to memory of 3500	4640	vbc.exe	84
PID 4640 wrote to memory of 100	4640	vbc.exe	85
PID 4640 wrote to memory of 100	4640	vbc.exe	85
PID 4640 wrote to memory of 100	4640	vbc.exe	85
PID 4640 wrote to memory of 100	4640	vbc.exe	85
PID 4640 wrote to memory of 100	4640	vbc.exe	85
PID 4640 wrote to memory of 100	4640	vbc.exe	85
PID 4640 wrote to memory of 100	4640	vbc.exe	85
PID 4640 wrote to memory of 100	4640	vbc.exe	85

C:\Users\Admin\AppData\Local\Temp\c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe
"C:\Users\Admin\AppData\Local\Temp\c849d828d2c86aa314047c3c2ff34dea1c8caaf80c0c07a95218668c84c5ba6b.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1392
- 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:4640
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\7gSCXimEbG.ini"
    3⤵
    PID:3500
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\TuZYvJH0Cs.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:100

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

Scripting

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\7gSCXimEbG.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/100-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/100-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/100-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/100-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1392-133-0x0000000074AB0000-0x0000000075061000-memory.dmp

Filesize
5.7MB

Download
memory/1392-138-0x0000000074AB0000-0x0000000075061000-memory.dmp

Filesize
5.7MB

Download
memory/1392-132-0x0000000074AB0000-0x0000000075061000-memory.dmp

Filesize
5.7MB

Download
memory/3500-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3500-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3500-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3500-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4640-148-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4640-142-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4640-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4640-155-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

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