isrstealer | ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146

Analysis

max time kernel
103s
max time network
135s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
07-11-2022 16:23

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General

Target

ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe
Size

411KB
MD5

a01fcb8ff07962da0a741648e74b3d3e
SHA1

8d23ebbf844d6d4ab14d958d713d52bdf09811fe
SHA256

ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146
SHA512

f36e3293fb5217a88ecef4f5331dac4f11599b92503445eddaeb1675db659675b0806943d0f7dff9f27199c77e2885a0bc43f09427cf7f37e41d4fd172669aad
SSDEEP

12288:/HE1sGf1s0tti1wIv2cPZXbV6INDd23+g:/um0tti+dUZNR23+

Score

10^/10

isrstealer collection persistence 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
behavioral2/memory/1684-144-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1684-157-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1684-170-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1684-171-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4008-167-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4008-168-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4008-169-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/4008-167-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4008-168-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4008-169-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 5 IoCs

pid	Process
1896	tmp12CC.tmp.exe
2488	tmp12CC.tmp.exe
1684	vbc.exe
4060	vbc.exe
4008	vbc.exe

UPX packed file 11 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4060-152-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4060-155-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4060-156-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4060-158-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4060-159-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4060-160-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4008-163-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4008-166-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4008-167-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4008-168-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4008-169-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	tmp12CC.tmp.exe

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
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-1-5-21-2891029575-1462575-1165213807-1000\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-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\1339172814.exe = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\tmp12CC.tmp.exe\""	tmp12CC.tmp.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 5076 set thread context of 1684	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	78
PID 1684 set thread context of 4060	1684	vbc.exe	79
PID 1684 set thread context of 4008	1684	vbc.exe	81

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe
Token: SeDebugPrivilege	1896	tmp12CC.tmp.exe
Token: SeDebugPrivilege	2488	tmp12CC.tmp.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1684	vbc.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 5076 wrote to memory of 1896	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	76
PID 5076 wrote to memory of 1896	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	76
PID 5076 wrote to memory of 1896	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	76
PID 1896 wrote to memory of 2488	1896	tmp12CC.tmp.exe	77
PID 1896 wrote to memory of 2488	1896	tmp12CC.tmp.exe	77
PID 1896 wrote to memory of 2488	1896	tmp12CC.tmp.exe	77
PID 5076 wrote to memory of 1684	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	78
PID 5076 wrote to memory of 1684	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	78
PID 5076 wrote to memory of 1684	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	78
PID 5076 wrote to memory of 1684	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	78
PID 5076 wrote to memory of 1684	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	78
PID 5076 wrote to memory of 1684	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	78
PID 5076 wrote to memory of 1684	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	78
PID 5076 wrote to memory of 1684	5076	ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe	78
PID 1684 wrote to memory of 4060	1684	vbc.exe	79
PID 1684 wrote to memory of 4060	1684	vbc.exe	79
PID 1684 wrote to memory of 4060	1684	vbc.exe	79
PID 1684 wrote to memory of 4060	1684	vbc.exe	79
PID 1684 wrote to memory of 4060	1684	vbc.exe	79
PID 1684 wrote to memory of 4060	1684	vbc.exe	79
PID 1684 wrote to memory of 4060	1684	vbc.exe	79
PID 1684 wrote to memory of 4060	1684	vbc.exe	79
PID 1684 wrote to memory of 4008	1684	vbc.exe	81
PID 1684 wrote to memory of 4008	1684	vbc.exe	81
PID 1684 wrote to memory of 4008	1684	vbc.exe	81
PID 1684 wrote to memory of 4008	1684	vbc.exe	81
PID 1684 wrote to memory of 4008	1684	vbc.exe	81
PID 1684 wrote to memory of 4008	1684	vbc.exe	81
PID 1684 wrote to memory of 4008	1684	vbc.exe	81
PID 1684 wrote to memory of 4008	1684	vbc.exe	81

C:\Users\Admin\AppData\Local\Temp\ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe
"C:\Users\Admin\AppData\Local\Temp\ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5076
- C:\Users\Admin\AppData\Local\Temp\tmp12CC.tmp.exe
  "C:\Users\Admin\AppData\Local\Temp\tmp12CC.tmp.exe" /pq
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1896
- - C:\Users\Admin\AppData\Local\Temp\tmp12CC.tmp.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp12CC.tmp.exe" /px
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of AdjustPrivilegeToken
    PID:2488
- C:\Users\Admin\AppData\Local\Temp\temp_FnQtviUGFO\vbc.exe
  "C:\Users\Admin\AppData\Local\Temp\temp_FnQtviUGFO\vbc.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1684
- - C:\Users\Admin\AppData\Local\Temp\temp_FnQtviUGFO\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\ZyhEAj4O5w.ini"
    3⤵
    - Executes dropped EXE
    PID:4060
- - C:\Users\Admin\AppData\Local\Temp\temp_FnQtviUGFO\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\Rbn6fvyMmF.ini"
    3⤵
    - Executes dropped EXE
    - Accesses Microsoft Outlook accounts
    PID:4008

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

T1064

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Scripting

T1064

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ZyhEAj4O5w.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\temp_FnQtviUGFO\vbc.exe

Filesize
1.1MB

MD5
d881de17aa8f2e2c08cbb7b265f928f9

SHA1
08936aebc87decf0af6e8eada191062b5e65ac2a

SHA256
b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

SHA512
5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

Download Submit
C:\Users\Admin\AppData\Local\Temp\temp_FnQtviUGFO\vbc.exe

Filesize
1.1MB

MD5
d881de17aa8f2e2c08cbb7b265f928f9

SHA1
08936aebc87decf0af6e8eada191062b5e65ac2a

SHA256
b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

SHA512
5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

Download Submit
C:\Users\Admin\AppData\Local\Temp\temp_FnQtviUGFO\vbc.exe

Filesize
1.1MB

MD5
d881de17aa8f2e2c08cbb7b265f928f9

SHA1
08936aebc87decf0af6e8eada191062b5e65ac2a

SHA256
b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

SHA512
5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

Download Submit
C:\Users\Admin\AppData\Local\Temp\temp_FnQtviUGFO\vbc.exe

Filesize
1.1MB

MD5
d881de17aa8f2e2c08cbb7b265f928f9

SHA1
08936aebc87decf0af6e8eada191062b5e65ac2a

SHA256
b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

SHA512
5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp12CC.tmp.exe

Filesize
411KB

MD5
a01fcb8ff07962da0a741648e74b3d3e

SHA1
8d23ebbf844d6d4ab14d958d713d52bdf09811fe

SHA256
ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146

SHA512
f36e3293fb5217a88ecef4f5331dac4f11599b92503445eddaeb1675db659675b0806943d0f7dff9f27199c77e2885a0bc43f09427cf7f37e41d4fd172669aad

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp12CC.tmp.exe

Filesize
411KB

MD5
a01fcb8ff07962da0a741648e74b3d3e

SHA1
8d23ebbf844d6d4ab14d958d713d52bdf09811fe

SHA256
ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146

SHA512
f36e3293fb5217a88ecef4f5331dac4f11599b92503445eddaeb1675db659675b0806943d0f7dff9f27199c77e2885a0bc43f09427cf7f37e41d4fd172669aad

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp12CC.tmp.exe

Filesize
411KB

MD5
a01fcb8ff07962da0a741648e74b3d3e

SHA1
8d23ebbf844d6d4ab14d958d713d52bdf09811fe

SHA256
ee61c3cd765c8722eb387c721240c3f9cac19815c6ca85232cf61cb21be0c146

SHA512
f36e3293fb5217a88ecef4f5331dac4f11599b92503445eddaeb1675db659675b0806943d0f7dff9f27199c77e2885a0bc43f09427cf7f37e41d4fd172669aad

Download Submit
memory/1684-157-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1684-171-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1684-144-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1684-170-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1896-142-0x0000000074850000-0x0000000074E01000-memory.dmp

Filesize
5.7MB

Download
memory/1896-137-0x0000000074850000-0x0000000074E01000-memory.dmp

Filesize
5.7MB

Download
memory/2488-140-0x0000000074850000-0x0000000074E01000-memory.dmp

Filesize
5.7MB

Download
memory/2488-143-0x0000000074850000-0x0000000074E01000-memory.dmp

Filesize
5.7MB

Download
memory/4008-169-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4008-168-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4008-167-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4008-166-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4008-163-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4060-152-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4060-160-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4060-159-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4060-158-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4060-156-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4060-155-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5076-132-0x0000000074850000-0x0000000074E01000-memory.dmp

Filesize
5.7MB

Download
memory/5076-148-0x0000000074850000-0x0000000074E01000-memory.dmp

Filesize
5.7MB

Download
memory/5076-136-0x0000000074850000-0x0000000074E01000-memory.dmp

Filesize
5.7MB

Download