isrstealer | fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d

General

Target

fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe
Size

266KB
MD5

5c8591a81043226eb3e4f57bd28bd690
SHA1

d10b73d09e0673da549252b71267c2558ac76676
SHA256

fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d
SHA512

101d3886c26522ba75b56e0da6fc2a5236626e4dd7e9d97567192a580737fc78184baf3e911da04044212ddc27a204d95072a75cdb47cd2bd57c1f8f26ffe2dd
SSDEEP

6144:/U2mLgw24La6nPwJjs9wpzknoI/EquGVFV1PKVqU/LkI95Zf2:/nR0amKjLkIU7zCV3j15Q

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
behavioral1/memory/1912-57-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1912-58-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1912-78-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1912-79-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1112-76-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1112-77-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/1112-76-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1112-77-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2012-62-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2012-66-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2012-67-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2012-68-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2012-69-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1112-71-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1112-75-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1112-76-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1112-77-0x0000000000400000-0x000000000041F000-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-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1076 set thread context of 1912	1076	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	27
PID 1912 set thread context of 2012	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	28
PID 1912 set thread context of 1112	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	29

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1076 wrote to memory of 1912	1076	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	27
PID 1076 wrote to memory of 1912	1076	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	27
PID 1076 wrote to memory of 1912	1076	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	27
PID 1076 wrote to memory of 1912	1076	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	27
PID 1076 wrote to memory of 1912	1076	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	27
PID 1076 wrote to memory of 1912	1076	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	27
PID 1912 wrote to memory of 2012	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	28
PID 1912 wrote to memory of 2012	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	28
PID 1912 wrote to memory of 2012	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	28
PID 1912 wrote to memory of 2012	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	28
PID 1912 wrote to memory of 2012	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	28
PID 1912 wrote to memory of 2012	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	28
PID 1912 wrote to memory of 2012	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	28
PID 1912 wrote to memory of 2012	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	28
PID 1912 wrote to memory of 2012	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	28
PID 1912 wrote to memory of 1112	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	29
PID 1912 wrote to memory of 1112	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	29
PID 1912 wrote to memory of 1112	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	29
PID 1912 wrote to memory of 1112	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	29
PID 1912 wrote to memory of 1112	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	29
PID 1912 wrote to memory of 1112	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	29
PID 1912 wrote to memory of 1112	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	29
PID 1912 wrote to memory of 1112	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	29
PID 1912 wrote to memory of 1112	1912	fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe	29

C:\Users\Admin\AppData\Local\Temp\fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe
"C:\Users\Admin\AppData\Local\Temp\fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1076
- C:\Users\Admin\AppData\Local\Temp\fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe
  "C:\Users\Admin\AppData\Local\Temp\fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1912
- - C:\Users\Admin\AppData\Local\Temp\fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\kKyIL5OIjs.ini"
    3⤵
    PID:2012
- - C:\Users\Admin\AppData\Local\Temp\fb0b0b34e17504a0d8ab823365fc89d9587e09731382b5988cd1c2c30354b87d.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\DWGxLAU4t7.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1112

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\kKyIL5OIjs.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1076-54-0x0000000076831000-0x0000000076833000-memory.dmp

Filesize
8KB

Download
memory/1112-77-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1112-76-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1112-75-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1112-71-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1912-55-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1912-57-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1912-79-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1912-78-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2012-62-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2012-69-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2012-68-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2012-67-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2012-66-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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